the quality of being unsteady and subject to changes | the act of changing one thing or position for another |
an instance of change; the rate or magnitude of change | a basketball maneuver; two defensive players shift assignments so that each guards the player usually guarded by the other |
a wave motion | a flexible implement used as an instrument of punishment |
| control consisting of a mechanical or electrical or electronic device for making or breaking or changing the connections in a circuit |
| railroad track having two movable rails and necessary connections; used to turn a train from one track to another or to store rolling stock |
| hairpiece consisting of a tress of false hair; used by women to give shape to a coiffure |
| an event in which one thing is substituted for another |