to look quickly or furtively Englisch:

The children were peeking through the fence into their neighbour's garden.

The definition of a peek is a quick look. An example of a peek is a quick glance inside a new car

No peeking!

I peeked out the window to see who was there.

Close your eyes. Don't peek. I've got a surprise for you.

can I peek at your infection?

You know,“ peek”, you take a peek...

I quietly take out my camera, so as not to be noticed by my photographic subject, and peek through the finder.