smooch (v.)youdaoicibaDictYouDict[smooch 词源字典]
1932, alteration of dialectal verb smouch "to kiss" (1570s), possibly imitative of the sound of kissing (compare German dialectal schmutzen "to kiss"). An earlier alteration produced smudge (v.) "to kiss, caress" (1844). Related: Smooched; smooching. As a noun by 1942.[smooch etymology, smooch origin, 英语词源]