To kiss thoroughly, repeatedly, or to cover with kisses.
From 'be-' prefix combined with 'kiss,' from Old English 'cyssan.' The 'be-' intensifies the kissing action.
This is one of the 'be-' verbs that still feels oddly natural despite being archaic—we understand 'bekiss' immediately because the prefix pattern is so logically consistent, even if we never use it.
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