Sentence:  The heavy motor warmed up with a <WSD>full-throated</WSD> roar, then there was a grinding clash of gears, and George felt the old house tremble under him as the truck swung out into the street and thundered off. 
Meaning of the word marked with <WSD> tags:  Using all the power of one's voice ("also used figuratively of noises made by inanimate objects").