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"veto" is also used as a crossword clue. If that's what you saw, the answer is often nix (3 letters).
Definitions
a vote that blocks a decision
Word origin
From Latin vetō (“to forbid”).
Used in a sentence
“Now, Republican legislators cannot afford to lose a single seat, in either chamber, if they want to continue to override his vetoes.”
“This contemptuous veto of her husband's on any intimacy with her family.”
“An outer detector (OD) region will act as both a passive shield for low energy backgrounds and an active veto for cosmic ray muons.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer2 curated clues
01“Official no”4 letters
02“Executive no”4 letters
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