If a guy winks at you does it still mean flirting?

Anonymous
There is a guy at work who is shy around me but the other day he winked at me when walking past. He's never done that before. Does it mean he has an interest in me or is he just being friendly? Guys do you normally wink at girls when your just being friendly or does it mean your interested in them on some level?!
If a guy winks at you does it still mean flirting?
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