Mo. Rev. Stat. § 92.332: Majority vote required.

In the event that a majority of the qualified voters voting on such proposition in such city at such election approve the proposition, then the ordinance shall be in effect. If a majority of the votes cast by the qualified voters voting are opposed to the proposal, then the governing body of the city shall have no power to impose the tax authorized by sections 92.325 to 92.340 unless and until the governing body of the city shall again have submitted another proposal to authorize the imposition and collection of the tax, and such proposal is approved by a majority of the qualified voters voting thereon.