Today's idiom is:

You can say that again.

We use "you can say that again" in situations when you strongly agree with someone.

Example 1

A: It's freezing today.

B: You can say that again. I'm wearing my biggest coat. (I agree. I'm wearing my biggest coat)

Example 2

A: I love chocolate ice-cream.

B: You can say that again. I eat it everyday.(I agree. I eat it everyday)

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