tip somebody the wink

Từ điển Oxford Advanced Learner 8th

tip sb the ˈwink | tip the ˈwink to sb idiom
(BrE, informal)to give sb secret information that they can use to gain an advantage for themselves
•There's no way he would have bought those shares if someone in the company hadn't tipped him the wink.
Main entry: ↑tip_idiom