donˈkey-man /-man/ noun

1. A man in charge of a donkey
2. /-mən/ in the merchant navy, (formerly) a man in charge of a donkey-engine, (now) a petty officer or senior rating in a ship's engine-room

donˈkey-pump noun

An extra steam pump

donkey vote noun (Aust)

1. In a preferential system of voting, a vote accepting the order of candidates on the ballot paper
2. Such votes collectively

donˈkey-work noun

Drudgery

argue or talk the hindlegs (or -leg) off a donkey

To argue or talk persistently and therefore usu persuasively

donkey's years

A long time (a pun on ears)