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Wiktionary
tune up

vb. 1 To make adjustments to an engine in order to improve its performance 2 To make preparations for vigorous exercise; to warm up

WordNet
tune up
  1. v. adjust for (better) functioning; "tune the engine" [syn: tune]

  2. of musical instruments; "My piano needs to be tuned" [syn: tune] [ant: untune]

Usage examples of "tune up".

The cities are streaming away from the red star as fast as they can tune up.