"peeping" in the verb sense
"He peeped at the woman through the window"
cause to appear
"he peeped his head through the window"
3. peep, cheep, chirp, chirrup
make high-pitched sounds
"the birds were chirping in the bushes"
speak in a hesitant and high-pitched tone of voice
appear as though from hiding
"the new moon peeped through the tree tops"
Source: WordNet® (An amazing lexical database of English)
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