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I know what

Phrase of the day

Discover a new phrase each day to use in your English! These are special phrases and sayings that English speakers use all the time, but you don't often see these phrases in English course books or other study material. Visit daily to learn some popular English phrases on a regular basis.

15 February 2026

I know what

We use this expression to say we have just had a good idea.

Written: No

Spoken: Yes

Formal: No

Informal: Yes

Example 1

What shall we do tonight?

I know what. Why don't we go to the circus that's just arrived in town? It could be fun.

Example 2

What can I get Renee for her birthday? I know what - I'll get her some bracelets.

Yes, she'll love that. She wears a lot of things like that.

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