(adverb, usually intr) to decrease or cause to decrease in quantity, degree, etc, esp graduallyhis interest in collecting stamps tailed off over the years
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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.