Elementary (A2)
IPA: /dɪˈkriːs/
KK: /dɪˈkris/
Definition
The act of making something smaller or less in amount, size, or degree.
Example
There was a noticeable decrease in temperature as the sun set.
Conversation

I heard there's been a noticeable decrease in air quality lately.

Yeah, I've noticed that too; it’s concerning.

It makes me wonder what we can do to reverse the decrease in pollution.

I've been trying to use public transport more to help out.
Synonyms & Antonyms
Synonyms
reduction
diminution
decline
Definition
To make something smaller in size, amount, or intensity.
Example
The company plans to decrease its production costs this year.
Tense Forms
Past: decreased
Past Participle: decreased
Conversation

Have you noticed how our expenses seem to decrease each month?

Yeah, I think we’re getting better at budgeting.

Exactly! If we keep this up, we might save even more.
Root Explanation
Decrease → It is formed from "de-" (meaning down or away) and "crescere" (meaning to grow). The word describes the act of growing down or reducing in size or amount.
Memory Tip
Think of something 'growing down' ('de-') — that's why decrease means to make something smaller.
Visually Confused Words
decease
redecrease
recrease
degrease
deceased
crease
undecreased
degreaser