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fine-tune

[fahyn-toon, -tyoon]
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verb (used with object), fine-tuned, fine-tun·ing.
  1. to tune (a radio or television receiver) to produce the optimum reception for the desired station or channel by adjusting a control knob or bar.
  2. tune(def 12).
  3. to make minor adjustments in so as to produce stability, improvement, or the precise results desired: to fine-tune the nation's economy.
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Origin of fine-tune

First recorded in 1920–25
Related formsfine-tun·er, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for fine-tune

fine-tune

verb
  1. (tr) to make fine adjustments to (something) in order to obtain optimum performance
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012