step-up

/S T EH1 P AH1 P/
noun
  1. 1

    (exercise) 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.

adjective
  1. 1

    That increases in stages.

  2. 2

    (of a transformer etc) That increases a voltage.

Antonyms

Source: https://en.wiktionary.org/wiki/step-up