donkey engine

World English Dictionary
donkey engine
 
n
a small auxiliary engine, such as one used for pumping water into the boilers of a steamship

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WordNet
donkey engine

noun
1. a locomotive for switching rolling stock in a railroad yard [syn: switch engine
2. (nautical) a small engine (as one used on board ships to operate a windlass) [syn: auxiliary engine
WordNet® 3.0, © 2006 by Princeton University.
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