From WordNet (r) 3.0 (2006):
mop up
n 1: a concluding action [syn: completion, culmination,
closing, windup, mop up]
v 1: to wash or wipe with or as if with a mop; "Mop the hallway
now"; "He mopped her forehead with a towel" [syn: wipe
up, mop up, mop]
2: defeat thoroughly; "He mopped up the floor with his
opponents" [syn: worst, pip, mop up, whip, rack up]
3: finish a task completely; "I finally got through this
homework assignment" [syn: get through, wrap up, finish
off, mop up, polish off, clear up, finish up]