Sentence:  “... One of those chaps over there said someone <WSD>feagues</WSD> his horse. What the hell's ‘<WSD>feague</WSD>'?” / O'Reilly's sides heaved. “<WSD>Feague</WSD>? You'd know it as a different expression, but it's a trick unscrupulous horse dealers use to make a horse look better than it is. You can judge a horse's spirit by the way it carries its tail.” / “That's what he said.” / “So,” said O'Reilly, “just before the buyer comes to look at the beast, the dealer sticks a clove of ginger up its rectum. <WSD>Feagues</WSD> the poor creature.” / The thought made Barry wince. 
Meaning of the word marked with <WSD> tags:  To increase the liveliness of a horse by inserting an irritant, such as a piece of peeled raw ginger or a live eel, in its fundament.