have a word with
have a word with {v. phr.}
1. To talk, discuss, or speak briefly with.
Robert, I need to have a word with you about tomorrow's exam.
2. To engage in a sincere discussion with the purpose of persuading the other person or let him or her know of one's dissatisfaction.
Our boss has been making funny decisions lately; I think we ought to have a word with him.
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Source: A Dictionary of American Idioms