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2 definitions found
 for step-up
From The Collaborative International Dictionary of English v.0.48 :

  Step-up \Step"-up`\, a. (Elec.)
     Transforming or converting a low-voltage current into one of
     high voltage; as, a step-up transformer.
     [Webster 1913 Suppl.]

From WordNet (r) 3.0 (2006) :

      n 1: the act of increasing something; "he gave me an increase in
           salary" [syn: increase, step-up] [ant: decrease,
           diminution, reduction, step-down]

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