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English word snog comes from Proto-Norse *snaggwu-
*snaggwu- (Proto-Norse)
snug (English)
(British) A small, comfortable back room in a pub.. (engineering) A lug. Close-fitting.. Close; concealed; not exposed to notice.. Comfortable; cosy (cozy); satisfactory. To make secure or snug.. To snuggle or nestle.
snog (English)
(British, slang) To kiss passionately. (British, slang) A passionate kiss.