washed up is the past form of wash up (just add -ed to the main verb).
wash up is a phrasal verb which means to do the dishes, to wash plates, glasses,ect after the meal.
In American English, it also means to wash your face and hands.
For example, when a mother tell her son “to get washed up”, it doesn’t means she want her son to wash dishes and plates, she want her son to wash his face and hands.
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