push-pull

Adjective

 * 1) Operated by pushing and pulling.
 * 2)  Operating with locomotives at both the head and rear of a train, or with a locomotive at one end and a driving position in the vehicle at the opposite end, so that the train can be driven from either end.
 * 3) Having two electronic devices in opposite phase.
 * 1) Having two electronic devices in opposite phase.
 * 1) Having two electronic devices in opposite phase.
 * 1) Having two electronic devices in opposite phase.

Noun

 * 1) An alternation or fluctuation between two opposites; a back-and-forth dispute, a tug of war.