Question 1

What does "go off the deep end" mean?

Accepted Answer

To react in an extreme or irrational way, often without thinking; to lose control of one's emotions.

Question 2

How do you use "go off the deep end" in a sentence?

Accepted Answer

He went off the deep end when he found out he wasn't promoted.

Question 3

Is "go off the deep end" formal or informal?

Accepted Answer

"go off the deep end" is register-neutral — appropriate in both casual and formal contexts. Used to describe someone who becomes very angry, distressed, or makes a radical decision.