(nautical) a small engine (as one used on board ships to operate a windlass)
a locomotive for switching rolling stock in a railroad yard
motor that converts thermal energy to mechanical work
something used to achieve a purpose
a wheeled vehicle consisting of a self-propelled engine that is used to draw trains along railway tracks
an instrument or machine that is used in warfare, such as a battering ram, catapult, artillery piece, etc.
domestic beast of burden descended from the African wild ass; patient but stubborn
the symbol of the Democratic Party; introduced in cartoons by Thomas Nast in 1874