Meaning of “washing-up” - Learner’s Dictionary

washing-up

noun [ U ] uk /ˌwɒʃɪŋˈʌp/ UK

A2 the activity of washing the dishes, pans, and other things you have used for cooking and eating a meal:

He was doing the washing-up.

(Definition of “washing-up” from the Cambridge Learner’s Dictionary © Cambridge University Press)