Increase and Its Opposite: Simple Guide
If you are learning English, you already know that increase means to make something larger in amount, size, or degree. Its most direct opposite is decrease, which means to make something smaller. This guide explains the difference clearly, gives you practical examples, and helps you avoid common mistakes so you can use both words correctly in writing, conversation, and email.
Quick Answer
Increase = to go up or become larger. Decrease = to go down or become smaller. Use increase when something grows. Use decrease when something shrinks. Both words can be verbs or nouns. Example: “Sales increased last month” and “There was a decrease in temperature.”
Understanding Increase and Decrease
These two words are direct antonyms. They are used in everyday English, business English, and academic writing. Knowing when to use each one helps you sound natural and precise.
Increase as a Verb
When you use increase as a verb, it means something becomes greater. You can use it with or without an object.
- Without an object (intransitive): “The price increased last month.”
- With an object (transitive): “The company increased the salary.”
Decrease as a Verb
Decrease works the same way. It means something becomes smaller.
- Without an object: “The temperature decreased overnight.”
- With an object: “We need to decrease our expenses.”
Increase and Decrease as Nouns
Both words can also be nouns. When used as nouns, they often follow words like a, an, or the.
- “There was a significant increase in traffic.”
- “We saw a decrease in complaints.”
Comparison Table: Increase vs. Decrease
| Aspect | Increase | Decrease |
|---|---|---|
| Meaning | To become larger or greater | To become smaller or less |
| Verb form | “The cost increased.” | “The cost decreased.” |
| Noun form | “An increase in demand.” | “A decrease in demand.” |
| Common contexts | Sales, temperature, population, speed, interest | Costs, errors, weight, time, risk |
| Formal tone | “We anticipate an increase.” | “We anticipate a decrease.” |
| Informal tone | “Prices went up.” | “Prices went down.” |
Natural Examples
Here are examples you might hear or write in real situations.
Everyday Conversation
- “My phone bill increased this month.”
- “The number of students decreased after the holiday.”
- “Can you increase the volume? I can’t hear.”
- “We should decrease the amount of sugar in this recipe.”
Email Context
- “Please note that our prices will increase starting next quarter.”
- “We have seen a decrease in response time since the update.”
- “Could you please increase the budget for marketing?”
- “The team worked hard to decrease the error rate.”
Formal Writing
- “The study reported an increase in average temperature over the last decade.”
- “A decrease in funding led to program cuts.”
- “Management decided to increase production capacity.”
- “The policy aims to decrease carbon emissions.”
Common Mistakes
Even advanced learners sometimes make these errors. Here is what to watch for.
Mistake 1: Using the Wrong Preposition
Do not say “increase of” when you mean “increase in.” Use increase in for the thing that grows.
- Wrong: “There was an increase of sales.”
- Right: “There was an increase in sales.”
Similarly, use decrease in.
- Wrong: “A decrease of temperature.”
- Right: “A decrease in temperature.”
Mistake 2: Confusing Increase with Rise
Rise is similar to increase, but rise is usually intransitive (no object). You cannot say “rise something.”
- Wrong: “The manager rose the prices.”
- Right: “The manager increased the prices.”
Mistake 3: Using Decrease When Reduce Is Better
Decrease and reduce are very close, but reduce is more common when someone actively makes something smaller. Decrease can happen naturally.
- “We reduced the budget.” (active decision)
- “The budget decreased.” (could be natural or passive)
Better Alternatives and When to Use Them
Sometimes you want a different word to sound more natural or precise. Here are some alternatives.
Instead of Increase
- Go up – informal, conversation: “Prices went up.”
- Rise – neutral, no object: “Temperatures rose.”
- Grow – gradual change: “The business grew.”
- Expand – size or scope: “We expanded the team.”
- Boost – active improvement: “This will boost sales.”
Instead of Decrease
- Go down – informal: “The numbers went down.”
- Drop – sudden or quick: “The price dropped.”
- Fall – similar to drop: “Demand fell sharply.”
- Reduce – active decision: “Reduce your screen time.”
- Lower – make something less: “Lower the volume.”
When to Use Increase vs. Alternatives
Use increase in formal writing and business reports. Use go up or rise in casual conversation. Use boost when you want to sound positive and active.
When to Use Decrease vs. Alternatives
Use decrease in neutral or formal contexts. Use drop or fall for sudden changes. Use reduce when someone takes action.
Mini Practice Section
Test yourself with these four questions. Answers are below.
- Choose the correct word: “We need to ______ the number of errors.” (increase / decrease)
- Fill in the blank: “There was a sharp ______ in temperature last night.” (increase / decrease)
- Is this sentence correct? “The manager decreased the prices last week.”
- Which word fits best? “The company plans to ______ production by 20%.” (rise / increase)
Answers
- Decrease – you want fewer errors.
- Decrease – temperature went down.
- Correct – you can use decrease with an object.
- Increase – rise cannot take an object here.
FAQ
1. Can I use increase and decrease in the same sentence?
Yes. For example: “While costs increased, profits decreased.” This is common in comparisons.
2. What is the difference between decrease and reduce?
Reduce usually implies a deliberate action by someone. Decrease can happen naturally or passively. “She reduced her spending” sounds active. “Her spending decreased” sounds like a result.
3. Is it correct to say “increase up” or “decrease down”?
No. Avoid these redundant phrases. Increase already means go up, and decrease already means go down. Just say “increase” or “decrease.”
4. How do I use increase and decrease in a graph description?
Use increase for upward trends and decrease for downward trends. Add adverbs like slightly, steadily, or sharply. Example: “Sales increased sharply in March, then decreased slightly in April.”
Final Tips
Practice using increase and decrease in your own sentences. Start with simple statements about things you see every day, like the weather, your expenses, or your study time. Over time, you will feel more confident choosing the right word. For more pairs like this, visit our Beginner Vocabulary Pairs section. You can also explore Common Opposites and Antonyms with Examples for deeper practice. If you have questions, check our FAQ or contact us.
