覗く

to peek (through a keyhole, gap, etc.), to look down into (a ravine, etc.), to peek into (a shop, bookstore, etc.), to sneak a look at, to take a quick look at, to peep (through a telescope, microscope, etc.), to stick out (a scarf from a collar, etc.), to peek through (sky through a forest canopy, etc.), to examine (an expression), to study (a face), to face