n. 25B6; verb
they peeked from behind the curtains : (HAVE A) PEEP, have a peek, spy, take a sly/stealthy look, sneak a look; informal take a gander, have a squint; Brit. informal have a dekko, have/take a butcher's, take a shufti.
the deer's antlers peeked out from the trees : APPEAR (SLOWLY/PARTLY), show, come into view/sight, become visible, emerge, peep (out).
25B6; noun a peek at the map : SECRET LOOK, sly look, stealthy look, sneaky look, peep, glance, glimpse, hurried/quick look; informal gander, squint; Brit. informal dekko, butcher's, shufti.