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peep out (of something) (at someone or something)
to sneak a glimpse of someone or something out of something, as through a hole. A little mouse peeped out of its hole at the bright lights in the room. Johnny, hiding in the closet, peeped out at the guests through the partly opened door.
1. To become partially visible behind a cover or obstacle: The moon peeped out from behind the clouds.
2. To give a quick look from behind a cover or obstacle: The child peeped out at us from behind the door.