Posset
properly means a drink taken before going to bed; it was milk curdled with wine.
“In his morning’s draught … his concerves or cates … and when he goeth to bedde his posset smoaking hot.”—Man in the, Moone (1609).
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Entry taken from
Dictionary of Phrase and Fable,
edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.