Is this your crossword clue?
"underlined" is also used as a crossword clue. If that's what you saw, the answer is often emphasised (10 letters).
Definitions
Marked beneath or emphasized.
Used in a sentence
“In HTML, wrapping text in <u> and </u> tags produces underlined text.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Marked for emphasis”10 letters
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U_________