say it: KLEE-nuhp
cleanup is a noun meaning "a very large profit". It carries 3 recorded senses.
(baseball) the fourth position in the batting order (usually filled by the best batter on the team)
baseball
the act of making something clean
“he gave his shoes a good cleaning”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for cleanup come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.