偷窥 (tōu kuī): to peep; to peek; to act as voyeur

She discovered that her neighbor often peeped at her from the window, felt very uneasy, and called the police.

This website was accused of illegally peeping at users' private information, sparking strong public protest.

Xiaoming hid behind a tree to peep at his classmates playing soccer, and when everyone found out, he blushed with shame.

The cat lay on the windowsill peeping at the baby birds in the nest, ready to pounce at any moment.

In the library, he secretly used his phone to peep at the notes of the classmate next to him, but was caught red-handed by the teacher.