step-up

(-up′)

adjective

that steps up, or increases; specif.,
  1. designating a transformer in which the output voltage is greater than the input voltage
  2. designating a gear that increases the speed

noun

an increase, as in amount, intensity, etc.

See step-up in American Heritage Dictionary 4

adjective
  1. Increasing in steps or by stages.
  2. Electricity Serving to increase voltage: a step-up transformer.
noun
An increase in size, amount, or activity.

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