Verb (5-dan, く, transitive)
1. to peek (through a keyhole, gap, etc.)
2. to look down into (a ravine, etc.)
3. to peek into (a shop, bookstore, etc.)
4. to sneak a look at; to take a quick look at
5. to peep (through a telescope, microscope, etc.)
Verb (5-dan, く, intransitive)
6. to stick out (a scarf from a collar, etc.); to peek through (sky through a forest canopy, etc.)
Verb (5-dan, く, transitive)
7. to examine (an expression); to study (a face)
Archaic
Verb (5-dan, く, intransitive)