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"grieve" is also used as a crossword clue. If that's what you saw, the answer is often mourn (5 letters).
Definitions
To feel deep sorrow after a loss.
Word origin
From Middle English greven, from Old French grever (“to burden”), from Latin gravō, gravāre, from adjective gravis (“grave”).
Used in a sentence
“Thy maidens griev'd themselves at my concern.”
“to grieve one's fate”
“Even if the executive director rules against the employee on appeal, the employee can still grieve the termination to the superintendent followed by an appeal to the … Board of Trustees.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Mourn deeply”6 letters
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