fine-tune

[fahyn-toon, -tyoon]
verb (used with object), fine-tuned, fine-tuning.
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.

Origin:
1920–25

fine-tuner, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
fine-tune
 
vb
(tr) to make fine adjustments to (something) in order to obtain optimum performance

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
Sure, it's an ambitious idea that could help urban thinkers fine-tune cities of
  the future.
Find out how to sharpen your skills and fine-tune your technique to turn your
  nature photos from so-so to spectacular.
In this theory, our photo receptors evolved over time to fine-tune our vision.
But conservationists are relying on current research to fine-tune their
  strategies.
Synonyms
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