donkey's years

donkey's years

noun Informal.
a very long time; eons.

Origin:
1895–1900; probably orig. donkey('s) ears, as rhyming slang for years, with years replacing ears once rhyming orig. was forgotten

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World English Dictionary
donkey's years
 
n
informal a long time

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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American Heritage
Idioms & Phrases

donkey's years

A long time, as in I haven't seen her in donkey's years. This expression punningly alludes to the considerable length of the animal's ears. [Early 1900s]

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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