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1. To glance quickly out from behind cover of some kind. The toddler peeped out from behind her parents' legs, then hid behind them again just as quickly. The rabbit peeped out of the burrow after it smelled the food I'd placed nearby.
2. To become partially or temporarily visible from behind cover of some kind. The sun has been peeping out of the clouds all day, but never for long enough to get warm. I could see my daughter's elbow peeping out from behind the curtains while we were playing hide and seek, but I pretended that I hadn't seen her.
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.