Definitions from Wiktionary (clean up)

▸ verb:  (transitive) To make an area or a thing clean; to pick up a mess; to tidy.
▸ verb:  (intransitive, idiomatic, colloquial) To become clean, handsome, smart in appearance, e.g. for a special occasion, especially when it is out of character to be seen as such.
▸ verb:  (transitive, idiomatic) To make something less corrupt or unseemly.
▸ verb:  (intransitive, idiomatic) To make a large profit; to win by a large margin, or to win a large amount, especially in gambling. Also clean house.
▸ verb:  (video games) To intervene in a fight between two players at low health and easily kill both of them or the winner.
▸ noun:  Misspelling of cleanup. [The act of cleaning or tidying something; the act of finishing something off.]

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