The act of turning around, or doubling back.
A pleat or fold.
The process or an instance of making something double; a multiplication by two.
An increase.
A workout movement wherein one leg stands on an elevated surface and lifts in the concentric part the rest of the body up onto it to target – depending on angle and starting distance of the other leg and weights applied by the arms – the femoral and gluteal muscles variously.
That increases in stages.
That increases a voltage.