Synonyms for (verb) lose it

Synonyms: break down, snap, lose it

Definition: lose control of one's emotions

Usage: When she heard that she had not passed the exam, she lost it completely; When her baby died, she snapped

Similar words: act, behave, do

Definition: behave in a certain manner; show a certain behavior; conduct or comport oneself

Usage: You should act like an adult; Don't behave like a fool; What makes her do this way?; The dog acts ferocious, but he is really afraid of people