grease gun

a hand-operated pump for greasing bearings under pressure.

1915–20 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
grease gun
a device for forcing grease through nipples into bearings, usually consisting of a cylinder with a plunger and nozzle fitted to it

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
The fitting allows grease to be inserted into the hub with a grease gun.
The employee wore a safety harness with a lanyard to tie-off on the tower while
  he used the grease gun.
The service truck contained an air compressor and a pneumatic grease gun.
Checks axle for gear oil and greases using a grease gun if needed.
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