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French word baiser comes from Proto-Indo-European *bu, and later Latin basium (Kiss, especially of the hand.)
*bu (Proto-Indo-European)
basium (Latin)
Kiss, especially of the hand.
basio (Latin)
I kiss.
baisier (Old French)
To kiss A kiss.
baiser (French)
Kiss (dated, outside, Canada) to kiss. (vulgar, _, slang) to break, deteriorate. (vulgar, _, slang) to prevail over someone, fuck, screw. (vulgar, _, slang, ambitransitive) to fuck, screw.