n. 藏猫游戏

[ noun ]
a game played with young children; you hide your face and suddenly reveal it as you say boo!
<noun.act>

Bopeep \Bo*peep"\, n. [Bo + peep.]
The act of looking out suddenly, as from behind a screen, so
as to startle some one (as by children in play), or of
looking out and drawing suddenly back, as if frightened.

I for sorrow sung,
That such a king should play bopeep,
And go the fools among. --Shak.