To kiss or to engage in kissing; an archaic or rare verb for the act of kissing.
From Latin 'basiare' meaning to kiss, derived from 'basium' (a kiss). This Latin-derived verb saw occasional use in English literature but remained quite rare.
Before 'kiss' became the standard English word, people sometimes used 'basiate' from Latin—it's a perfect example of how some fancy Latin words for everyday actions never really caught on in English, even though they were technically available.
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