Because the hiragana ends with an う sound, you know this word is a verb. The kanji itself means peek, so the verb version is to peek or to peep at.

覗く refers to peering or looking into something, often with a sense of curiosity or secrecy. You'll hear it in daily situations like すき間から覗く (to peek through a small gap) or even figuratively, like 様子を覗く (to take a look to see how things are going).

The reading is the one you learned with the kanji. Go back and take a peek at the kanji page again if you forgot!