The verb "peep" or "peeped' is often followed by "in" or "into", based on the noun/pronoun and verb tense.
Example sentences:
I wanted to just peep in the window and quietly leave.
I peeped into the cage but feared waking the sleeping bear.
He peeped into the room so he wouldn't wake his sleeping child.
Peep (refers to catching a quick sighting of something) eye (to look at something) sees
The Wombles - 1973 Peep-Peep-Peep 1-6 is rated/received certificates of: Australia:G
Bo Peep Bo Peep was created on 2011-09-28.
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peep
A Quick Peep was created in 2002.
Peep This was created on 1994-07-19.
Peep Lassmann was born in 1948.
A Peep into the Past was created in 1923.
Peep - album - was created in 1995.
Peep Jänes was born in 1936.
One can say "peep" in French as "pioupiou" or "cui-cui."