adjective Operated by pushing and pulling. Operating with a locomotive at one end and a control car at the opposite end, so that the train can be driven from either end.
adjective Operating with a locomotive at one end and a control car at the opposite end, so that the train can be driven from either end.
adjective Having two electronic devices in opposite phase.
noun An alternation or fluctuation between two opposites; a back-and-forth dispute, a tug of war.