morbid (adj.)youdaoicibaDictYouDict[morbid 词源字典]
1650s, "of the nature of a disease, indicative of a disease," from Latin morbidus "diseased," from morbus "sickness, disease, ailment, illness," from root of mori "to die," which is possibly from PIE root *mer- "to rub, pound, wear away" (cognates: Sanskrit mrnati "crushes, bruises;" Greek marainein "to consume, exhaust, put out, quench," marasmus "consumption"). Transferred use, of mental states, is from 1777. Related: Morbidly; morbidness.[morbid etymology, morbid origin, 英语词源]
pestle (n.)youdaoicibaDictYouDict
mid-14c. (as a surname late 13c.), from Old French pestel, from Latin pistillum "pounder, pestle," related to pinsere "to pound," from PIE *pis-to-, suffixed form of root *peis- "to crush" (cognates: Sanskrit pinasti "pounds, crushes," pistah "anything ground, meal," Greek ptissein "to winnow," Old Church Slavonic pišo, pichati "to push, thrust, strike," pišenica "wheat," Russian pseno "millet").
smart (v.)youdaoicibaDictYouDict
Old English smeortan "be painful," from Proto-Germanic *smarta- (cognates: Middle Dutch smerten, Dutch smarten, Old High German smerzan, German schmerzen "to pain," originally "to bite"), from PIE *smerd- "pain," an extension of the root *mer- (2) "to rub; to harm" (cognates: Greek smerdnos "terrible, dreadful," Sanskrit mardayati "grinds, rubs, crushes," Latin mordere "to bite"). Related: Smarted; smarting.