word to the wise, a

a word to the wise

A phrase that emphasizes a statement as advice. It is a shortening of the phrase "a word to the wise is sufficient," meaning that a wise or intelligent person can take a hint and does not need a long explanation. A word to the wise—don't use Amy's baby shower as an opportunity to announce your engagement. Stay away from the boss today, he's in a bad mood. Just a word to the wise.
See also: wise, word

word to the wise, a

Here's good advice, as in A word to the wise: don't walk alone here because these streets are not safe at night. A shortening of A word to the wise is enough, as it was put by Roman writers, this phrase in English dates from the mid-1500s.
See also: word