I. ˈpēkəˌbü noun
Etymology: peek (I) + connective -a- + boo, interjection
: a game for amusing a baby in which one repeatedly hides his face or body and pops back into view exclaiming “Peekaboo!”
II. | ̷ ̷ ̷ ̷| ̷ ̷ adjective
1. : trimmed with eyelet embroidery
a peekaboo blouse
2. : made of sheer or transparent fabric
dons a peekaboo negligee — S.J.Perelman