fine-tune

UK: /ˌfaɪnˈtjuːn/ US: (fīn′to̅o̅n′, -tyo̅o̅n′)

Inflections of 'fine-tune' (v): (⇒ conjugate)

fine-tunes

v 3rd person singular

fine-tuning

v pres p

fine-tuned

v past

fine-tuned

v past p

WordReference Random House Unabridged Dictionary of American English © 2025

fine-tune  (fīn′to̅o̅n′, -tyo̅o̅n′), v.t., -tuned, -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. 16).
3. to make minor adjustments in so as to produce stability, improvement, or the precise results desired:
   to fine-tune the nation's economy.

• 1920–25

fine′-tun′er, n. 

Collins Concise English Dictionary © HarperCollins Publishers::

fine-tune verb

1. (transitive) to make fine adjustments to (something) in order to obtain optimum performance