From Longman Dictionary of Contemporary Englishwash up phrasal verb1 British EnglishDHCWASH to wash plates, dishes, knives etc → washing-up2 American EnglishWASH to wash your hands Go wash up before dinner.3 wash something ↔ upTAKE/BRING if waves wash something up, they carry it to the shorewash something ↔ up on His body was washed up on the beach the next morning. → washed-up → wash→ See Verb table
Examples from the Corpus
wash on• Which doesn't mean I intend to leap into bed with you just because fate washed you up on my beach.wash-upˈwash-up noun [uncountable] the wash-up period is the last few days of the British parliament, after a general election has been announced. During this time the government tries to get remaining laws passed quickly, with the help of the opposition parties The bill was pushed through quickly during wash-up, and some MPs have complained that there was not enough opportunity for a democratic debate. 