(informal) to keep a low profile, to lie low

to make oneself believe stories.

(somewhat formal) (transitive with de) To have no interest in someone or something; to not care about something

(euphemistic) to do one's business, to relieve oneself

to fool around

to teethe / to cut one's teeth

to prove oneself, to prove one's worth, to win one's spurs, to earn one's stripes, to earn one's wings

(idiomatic) to suck up to; flatter too much

to start again from scratch, to start again with a clean slate

(informal) why? what for? to what end?