Noun

1. Control consisting of a mechanical or electrical or electronic device for making or breaking or changing the connections in a circuit
2. An event in which one thing is substituted for another
3. Hairpiece consisting of a tress of false hair; used by women to give shape to a coiffure
4. Railroad track having two movable rails and necessary connections; used to turn a train from one track to another or to store rolling stock
5. A flexible implement used as an instrument of punishment
6. A basketball maneuver; two defensive players shift assignments so that each guards the player usually guarded by the other
7. The act of changing one thing or position for another

Verb

1. Change over, change around, as to a new order or sequence
2. Exchange or give (something) in exchange for
3. Lay aside, abandon, or leave for another
4. Make a shift in or exchange of
5. Cause to go on or to be engaged or set in operation
6. Flog with or as if with a flexible rod
7. Reverse (a direction, attitude, or course of action)