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"annul" is also used as a crossword clue. If that's what you saw, the answer is often cancel (6 letters).
Definitions
To cancel, invalidate, or declare something legally void.
Word origin
From Middle English annullen, from Old French anuller, from Latin annullō (“annihilate, annul”), from ad (“to”) + nūllus (“none, not any”).
Used in a sentence
“They tried to reassure me but I was not able to annul my fears.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Void legally”5 letters
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