Idioms with meaning and example

Beard the lion in his den -

Meaning - Challenge someone in his own area.

Example - If he doesn't come to see me today, I'll have to beard the lion in his den.

***Keep a stiff upper lip ***-

Meaning - Refers to a person who doesn't show off his emotions.

Example - He heard the news about his father's demise but kept a stiff upper lip.

Go bananas -

Meaning - Refers to someone who behaves in a crazy way out of emotions.

Example- Your decision to go abroad for a year will make your family go bananas.