<p><strong>Noun</strong></p><ul><li>a person or thing that pushes.</li><li>Slang: a peddler of illegal drugs.</li><li>Aeronautics: an airplane that is driven by pusher propellers.</li><li>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, spanker.</li><li>Railroads: a helper attached to the rear of a train, usually to provide extra power for climbing a steep grade.</li></ul>