Extinguishing or removing burning material near control lines, felling snags, and trenching logs to prevent rolling after an area has burned, to make a fire safe, or to reduce residual smoke.
Mop up is army slang for to slaughter, to defeat utterly.
Refers to the bullpen's least effective reliever who comes in when the results of the game are almost decided.
the act, process, or an instance of mopping up; completion of an operation or action.