Idioms about Fruits and Vegetables

via: Cambridge Dictionary

(as) cool as a cucumber

-

very calm or very calmly, especially when this is surprising:

e.g/She walked in as cool as a cucumber, as if nothing had happened.

couch potato

a person who sits and watches a lot of television and does not have an active life

Her kid is such a couch potato.

bananas

very silly:

You're going out in this weather? You must be bananas!

go bananas

to become extremely angry or excited:

She'll go bananas when you tell her the news.

in your salad days

during the period of time when you were a young person and had little experience:

I met her in my salad days.