All the fat is in the fire. The allusion is to the process of
frying. If the grease is spilt into the fire, the coals smoke and blaze
so as to spoil the food. The proverb signifies that something has been
let out inadvertently which will cause a “regular flare up.”
Alfonzo II. of Portugal. (1212-1223.)
Charles II. of France, le Gros. (832, 881-888.) Louis VI. of
France, le Gros. (1078, 1108-1137.)
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894
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