a word in (one's) ear

A private, often brief, communication with one, often to issue a suggestion or warning. I'm confident that that intern will stop slacking off once I have a word in his ear. I tried to put a word in Tom's ear about that part of the presentation, but he wouldn't listen. And, sure enough, the boss didn't like it. Sir, may I have a word in your ear? I don't think you should dismiss her account of the events so summarily.

a word in someone's ear

BRITISH

If you have a word in someone's ear, you speak to them quietly and privately, usually to give them advice. I really don't think he should speak to Alice like that in meetings. Perhaps I should have a word in his ear. I'll go and see Quennell. It won't be official, mind. Just a word in his ear over a drink.