To play at bo-peep. To peep out suddenly from a hiding place, and cry bo! a children's game.
They then for sudden joy did weep,
And I for sorrow sung,
That such a king should play bo-peep,
And go the fools among.
Shakspeare.
There the devil plays at bo-peep, puts out his horns to do mischief, then shrinks them back for safety.--Dryden.