ingratiate (v.)youdaoicibaDictYouDict[ingratiate 词源字典]
1620s, possibly via 16c. Italian ingraziarsi "to bring (oneself) into favor," from Latin in gratiam "for the favor of," from in "in" (see in- (2)) + gratia "favor, grace" (see grace).[ingratiate etymology, ingratiate origin, 英语词源]