peeping
v. B2 Upper Intermediate US //ˈpipɪŋ// UK //pˈiːpɪŋ// peep·ing
v. to look at something or someone secretly and quickly, usually because you are curious or trying to be sneaky.
v. to look at something or someone secretly and quickly, typically from a hidden position or without permission.
He was peeping through the window to see who was outside.
The children were peeping at the new neighbors through the fence to see what they were doing.
While the detective was peeping through the curtains to gather evidence, he remained careful not to move his head enough to be noticed by the suspects.