peephole, peeping hole

A hole or crevice through which one may look or peep without being discovered. "The peep - holes in his crest."- Prior : Alma , ii. 182. Peep-o'-day-boys, s. pl . A name given to the Irish insurgents of 1784, from their visiting the houses of the loyal Irish in search of arms at early dawn. ( Eng . Cant .)