Choose from the options opposite in meaning to the word underlined.
When the driver applied the brakes, they acted up.
A
failed
B
responded well
C
were sluggish
D
jammed
Verified Correct Answer: B.
Grammar & Contextual Explanation
The phrase "acted up" implies that the brakes malfunctioned or did not perform well. Therefore, the opposite would be that it "responded well."
Source: Myschool Past Questions Archive (Record #11385)