wink

A wink is a quick movement of one eye to show friendship or playfulness.

When people wink at each other, it's usually a way of being funny or teasing without actually saying something mean. You might see it on TV when actors are trying to be cool and playful with each other, or you might experience it in real life when a friend is joking around with you. Sometimes people also wink to convey that they're in on the joke, like if someone tells a secret and then winks at another person who knows what's going on. It's a lighthearted way of communicating without using words, and it can add some fun and personality to a conversation or situation.