mopyoudaoicibaDictYouDict
mop: [15] Mop first appeared in the guise mappe, a late 15th-century sailors’ term for an improvised brush used for caulking ships’ seams with tar. The modern form mop, presumably the same word, did not emerge until the mid-17thcentury. It may be a truncation of an earlier mapple ‘mop’ [15], which came from late Latin mappula ‘towel, cloth’, a diminutive form of Latin mappa ‘cloth’ (source of English map).
=> map
caulk (v.)youdaoicibaDictYouDict
late 14c., "to stop up crevices or cracks," from Old North French cauquer, from Late Latin calicare "to stop up chinks with lime," from Latin calx (2) "lime, limestone" (see chalk). Original sense is nautical, of making ships watertight. Related: Caulked; caulking. As a noun, "caulking material," by 1980 (caulking in this sense was used from 1743). Related: Caulker.