Definition of mopping-up in English:

mopping-up

Pronunciation /ˌmɒpɪŋˈʌp/

noun

  • The action or an act of mopping up; (Military) the action of completing the occupation of an area by capturing or killing any remaining enemy forces.

Origin

Early 20th century; earliest use found in The Westminster Gazette. From mopping + up, after mop.