(adverb, usually intransitive) to decrease or cause to decrease in quantity, degree, etc, esp gradually: his interest in collecting stamps tailed off over the years
Slang definitions & phrases for tail off
one's ass off
adverb phrase
Very hard; one's best; to one's utmost: I worked my ass off for that ungrateful jerk/ listen to that drummer play his buns off
Idioms and Phrases with tail off
tail off
Also, tail away. Diminish gradually, subside, as in The fireworks tailed off into darkness. [ Mid-1800s ]