n. 25B6; verb
I peeped through the keyhole : LOOK QUICKLY, cast a brief look, take a secret look, sneak a look, (have a) peek, glance; informal take a gander, have a squint; Brit. informal have a dekko, have/take a butcher's, take a shufti.
the moon peeped through the clouds : APPEAR (SLOWLY/PARTLY), show, come into view/sight, become visible, emerge, peek, peer out.
25B6; noun I'll just take a peep at it : QUICK LOOK, brief look, sneaky look, peek, glance; informal gander, squint; Brit. informal dekko, butcher's, shufti.