[peek.a.boo] n [[1]peek + [1]boo] (1599): a game for amusing a baby by repeatedly hiding one's face or body and popping back into view exclaiming "Peekaboo"
[2]peekaboo adj (1895) 1: trimmed with eyelet embroidery "a ~ blouse"
2: made of a sheer or transparent fabric
3: offering only limited display or disclosure esp. of a teasing sort "~ publicity"