Word: peekaboo
(games) A game for a small child in which one covers one's face, then suddenly reveals it, saying "Boo!" or "Peekaboo!".
To peep out.
(of clothing) with holes, slits or transparent fabric to reveal what is normally hidden. Example: The model was wearing a peekaboo swimsuit.
Boo (when showing oneself unexpectedly)
You can find a list of possible crossword clues for PEEKABOO below.