do up verb8 •To fasten (a piece of clothing, etc.); to tighten (a nut etc.)I can't do up my shirt. The button is missing.Help me do up this zipper. •(informal) To redecorate (a room, etc.); to make improvements to (a home or domestic property).I'm going to do up the living room next.They've done up the house so that they can sell it more easily. •To style (someone's hair); (especially) to give someone (i.e., oneself or another) an updo. •To pack together and envelop; to pack up, tie up, or both.I did up the parcel with string and took it to the post office. •(informal) To execute a task or performance; to execute it well.This time I'm going to do it up right.Previously they had cut corners on the dinner menu, but this time they really did it up. •(old-fashioned) To accomplish thoroughly. •(slang) To beat up; to physically assault. •(no longer used) To starch and iron.a rich gown of velvet, and a ruff done up with the famous yellow starch — 1850 formsdid up · done up · doing up · does up