atrophy
Meaning: to wither away, decay
Usage: If muscles do not receive enough blood, they will soon atrophy and die.
enervate
Meaning: to weaken, exhaust
Usage: Writing these sentences enervates me so much that I will have to take a nap after I finish.
abate
Meaning: to reduce, lessen
Usage: The rain poured down for a while, then abated.
curtail
Meaning: to lessen, reduce
Usage: Since losing his job, he had to curtail his spending.
palliate
Meaning: to reduce the severity of
Usage: The doctor trusted that the new medication would palliate her patient’s discomfort.
wane
Meaning: to decrease in size, dwindle
Usage: Don’t be so afraid of his wrath because his influence with the president is already beginning to wane.