To appear very calm and composed.
As cool as a cucumber
When someone is acting very emotional and crazy we say: "They have...
"They have gone bananas"
Used to refer to an attitude in which someone adopts a negative attitude to something because they cannot have it themselves.
Sour grapes
When we aren't sure how truthful something is.
Take something with a pinch of salt.
When two people are very similar
Two peas in a pod
When you are very careful about saying or doing something out of fear of upsetting someone
Walking on eggshells
When you talk about things you don't like
Not my cup of tea
(of a person or animal) suffer severely or die from hunger.
Starving
This expression means you shouldn't dwell on your misfortunes or things you can't change.
Don't cry over spilt milk
Someone that's so picky about their food and is always complaining about it.
A fussy eater
If there is a delicate issue that people can't agree on
Hot potato