0 to use a piece of cloth or a mop to remove liquid from the surface of something: --
There's milk on the floor over there - could you get a cloth and mop it up?
1 to finish dealing with something: --
It took a week to mop up the last of the enemy soldiers (= defeat them).
NYA ORD
European
May 10, 2021
DAGENS ORD
Shimmer
mop sth up