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"expression" is also used as a crossword clue. If that's what you saw, the answer is often idiom (5 letters).
Definitions
A phrase, look, or way of showing a thought or feeling.
Word origin
Borrowed from Middle French expression, from Late Latin expressiō, expressiōnem (“a pressing out”).
Used in a sentence
“The expression "break a leg!" should not be taken literally.”
“They stared at the newcomer with a puzzled expression.”
“The best poker players can tell if the opponents have a good hand by looking at their expression.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Look”10 letters
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