moil (v.)youdaoicibaDictYouDict[moil 词源字典]
"to labour in the mire" [Johnson], c. 1400, from Old French moillier "to wet, moisten" (12c., Modern French mouiller), from Vulgar Latin *molliare, from Latin mollis "soft," from PIE *mel- "soft" (see mild). Related: Moiled; moiling.[moil etymology, moil origin, 英语词源]
moil (n.)youdaoicibaDictYouDict
"toil, labor," 1612, from moil (v.).