motor that converts thermal energy to mechanical work
change over, change around, as to a new order or sequence
something used to achieve a purpose
control consisting of a mechanical or electrical or electronic device for making or breaking or changing the connections in a circuit
exchange or give (something) in exchange for
lay aside, abandon, or leave for another
a wheeled vehicle consisting of a self-propelled engine that is used to draw trains along railway tracks
an event in which one thing is substituted for another
make a shift in or exchange of; then we switched"
an instrument or machine that is used in warfare, such as a battering ram, catapult, artillery piece, etc.