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To clean someone or something by wiping or mopping. A noun or pronoun can be used between "mop" and "down." I just need to mop down the floors before our guests arrive. She mopped the child down as best as she could after he vomited all over himself.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
mop something down
to clean a surface with a mop. Please mop this floor down now. Please mop down this floor.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.