A sealed box with a slit, into which a voter puts a completed voting slip. / The process or method of voting.

plural of ballot box

(Ireland, historical) Electoral strategy pursued by the Irish Republican movement in the 1980s and early 1990s, where elections in Northern Ireland and the Republic of Ireland were contested by Sinn Féin, while the IRA continued military operations against the British Army and RUC.

(idiomatic, politics) To commit fraud in an election by depositing extra or otherwise illegitimate ballots into the container holding voters' ballots, in an attempt to predetermine the outcome.

present participle of stuff the ballot box