A children's game where someone hides their face and suddenly reveals it while saying 'peekaboo!'; also used to describe clothing with strategic cutouts.
From 'peek' (to look quickly) and 'boo' (to suddenly appear and startle). The compound emerged in the 16th century as an expression accompanying the children's game.
Babies love peekaboo because it teaches 'object permanence'—the realization that things still exist even when hidden—so this silly game is actually teaching crucial brain development!
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