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Phrase(s): A word to the wise (is enough). [and] A word to the wise is sufficient.
Prov. You only have to hint something to wise people in order to get them to understand it.; Wise people do not need long explanations. (Often used to signal that you are hinting something.) • John’s a pleasant man, but I wouldn’t trust him with money. A word to the wise, eh? • Donna hinted about Lisa’s drinking problem to Lisa’s fiancé, hoping that a word to the wise would be enough., Phrase(s): a word to the wise
a good piece of advice; a word of wisdom. (See also A word to the wise (is enough).) • If I can give you a word to the wise, I would suggest going to the courthouse about an hour before your trial. • Here is a word to the wise. Keep your eyes open and your mouth shut.
McGrawhill's American Idioms And Phrasal Verbs