From Longman Dictionary of Contemporary English(have/drop) a word in somebody’s ear(have/drop) a word in somebody’s earto say something to someone privately, especially to give them advice or a warning If I were you, I’d have a word in his ear before it’s too late. → word
Examples from the Corpus
(have/drop) a word in somebody’s ear• A word in the ear of the Weatherfield constabulary.• His resolve ends when again he wakes at dawn with prophetic words in his ears.• Mixed blessings' A word in your ear.• If I were you I'd drop a quiet word in her ear before it's too late. 