To wink is to indicate that you understand something without actually saying anything. You might wink at someone when you know that they are going to ask you a difficult question.
He winked at me when he saw that I was lost.
She winked at me when she saw that I was wearing her favorite dress.
verb
To close one's eyes in sleep.
verb
To close one's eyes.
verb
Usually followed by at: to look the other way, to turn a blind eye.
Synonyms:
verb
To close one's eyes quickly and involuntarily; to blink.
verb
To blink with only one eye as a message, signal, or suggestion, usually with an implication of conspiracy. (When transitive, the object may be the eye being winked, or the message being conveyed.)
verb
To gleam fitfully or intermitently; to twinkle; to flicker.