- (adverb, usually intr) to decrease or cause to decrease in quantity, degree, etc, esp graduallyhis interest in collecting stamps tailed off over the years
Idioms and Phrases with tail off
Also, tail away. Diminish gradually, subside, as in The fireworks tailed off into darkness. [Mid-1800s]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.