veto

(noun) a vote that blocks a decision.

(noun) the power or right to prohibit or reject a proposed or intended act (especially the power of a chief executive to reject a bill passed by the legislature).

(verb) vote against; refuse to endorse; refuse to assent. Synonyms: blackball, negative. Example: "The president vetoed the bill."

(verb) command against. Synonyms: forbid, prohibit, interdict, proscribe, disallow, nix. Examples: "I forbid you to call me late at night." "Mother vetoed the trip to the chocolate store." "Dad nixed our plans."