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He is like Hunt’s dog, will neither go to church nor stay at home. One Hunt, a labouring man at a small town in Shropshire, kept a mastiff, who on being shut up on Sundays, whilst his master went to church, howled so terribly as to disturb the whole village; wherefore his master resolved to take him to church with him: but when he came to the church door, the dog having perhaps formerly been whipped out by the sexton, refused to enter; whereupon Hunt exclaimed loudly against his dog’s obstinacy, who would neither go to church nor stay at home. This shortly became a bye-word for discontented and whimsical persons.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
Hunks * HuntingNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes
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Francis Grose was independently wealthy, having inherited money from his father, a jeweller. Finding himself overspending, he published a number of books; his Provincial Glossary seems to have been the starting-point for the Vulgar Tongue reproduced here.