mop (n.) Look up mop at Dictionary.com
late 15c., mappe "bundle of yarn, etc., fastened to the end of a stick for cleaning or spreading pitch on a ship's decks," from Walloon (French) mappe "napkin," from Latin mappa "napkin" (see map (n.)). Modern spelling by 1660s. Of hair, from 1847.
mop (v.) Look up mop at Dictionary.com
1709, from mop (n.). Related: Mopped; mopping.