peep

the short weak cry of a young bird

a secret look

look furtively; “He peeped at the woman through the window”

cause to appear; “he peeped his head through the window”

make high-pitched sounds; “the birds were chirping in the bushes”

speak in a hesitant and high-pitched tone of voice

appear as though from hiding; “the new moon peeped through the tree tops”