Longman Dictionary of Contemporary English homepage

Date: 1700-1800
Origin: Perhaps from dun (=gray-brown) + -key (as in monkey)

donkey

 noun
     
donkey
Related topics: Animals
don‧key
1HBA [countable] a grey or brown animal like a horse, but smaller and with long ears
2

donkey's years

British English spoken a very long time
for donkey's years
I've had this jacket for donkey's years.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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