peep - speak in a hesitant and high-pitched tone of voice
cheep, chirp, chirrup, peep - make high-pitched sounds
Example:- the birds were chirping in the bushes
peep - look furtively
Example:- He peeped at the woman through the window
peep - cause to appear
Example:- he peeped his head through the window
peep - appear as though from hiding
Example:- the new moon peeped through the tree tops