word to the wise
A word of warning or advice which the intelligent person is expected to follow. A proverb.
I had once spoken to him about being late all the time, and thought that a word to the wise was enough.
words of one syllable
Language that makes the meaning very clear; simple, or frank language. Usually used after in.
Mary explained the job to Ann in words of one syllable so that she would be sure to understand.
Some people say that John is cute and mischievous, but in words of one syllable, he's just a brat.