Kissing
来自Big Physics
Old English cyssan (verb), of Germanic origin; related to Dutch kussen and German küssen .
wiktionary
From Middle English cussinde, from Old English cyssende, from Proto-Germanic *kussijandz, equivalent to kiss + -ing. Cognate with Saterland Frisian küsjend, Dutch kussend, German Low German küssend, German küssend, Swedish kyssande, Icelandic kyssandi.
From Middle English kissinge, kyssynge, kessinge, from Old English *cyssing (compare Old English cossettung(“kissing”)), equivalent to kiss + -ing.
etymonline
kissing (n.)
c. 1300, verbal noun from kiss (v.). Kissage is attested from 1886.
kissing (adj.)
1580s, present-participle adjective from kiss (v.). For kissing cousin, see cousin.
