From Middle English kissen, kussen, from Old English cyssan, from Proto-Germanic *kussijaną, cognates include Danish kysse, Dutch kussen, German küssen, Icelandic kyssa,
Norwegian kysse
and Swedish kyssa. Possibly from Proto-Indo-European *ku, *kus (probably imitative), with cognates including Ancient Greek κύσσω, poetic form of κύσω, and Hittite.
From Middle English kis, kys, kus, forms of cos influenced by kissen, from Old English coss, from Proto-West Germanic *koss, from Proto-Germanic *kussaz.
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