a person or thing that pushes.
Slang. a peddler of illegal drugs.
Aeronautics. an airplane that is driven by pusher propellers.
Nautical. one of the masts abaft the mizzen on a sailing vessel having more than three masts, either the sixth or seventh from forward. Compare driver ( def 10b ), spanker ( def 1b ).
Railroads. a helper attached to the rear of a train, usually to provide extra power for climbing a steep grade.

1585–95; push + -er1

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World English Dictionary
pusher (ˈpʊʃə)
1.  informal a person who sells illegal drugs, esp narcotics such as heroin and morphine
2.  informal an actively or aggressively ambitious person
3.  a.  a type of aircraft propeller placed behind the engine
 b.  a type of aircraft using such a propeller
4.  a person or thing that pushes
5.  (Brit) a rakelike implement used by small children to push food onto a spoon
6.  (Austral) the usual name for pushchair

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
It would have a pusher-style propeller drive, designed to be perfect for the long, rural commutes.
Aircraft have had two types of propeller configurations: pusher propellers and
  tractor propellers.
Other furnaces considered for the application include retort furnaces and
  pusher furnaces.
Mechanical pusher used to feed post-tensioning strands through the panels.
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