words of one syllable
words of one syllable {n. phr.}
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.
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Source: A Dictionary of American Idioms