From sneck (“latch”) + posset (“curdle, turn”).
give a sneck posset
- (archaic, UK, literally) To fasten the door latch.
- (idiomatic, UK) To give someone a cold reception; to close the door on someone; to reject them.
- sneck posset, in Thesaurus of Traditional English Metaphors, by Peter Richard Wilkinson, 2002.
- sneck posset, in Dictionary of Phrase and Fable, by Ebenezer Cobham Brewer, 1894, page 1155