fine–tune 
/ˈfaɪnˈtu:n/ verb
fine–tunes; fine–tuned; fine–tun·ing /ˈfaɪnˈtu:n/ verb [+ obj] : to make small changes to (something) in order to improve the way it works or to make it exactly right
▪ fine-tune a TV set ▪ fine-tune the temperature of the room ▪ They're fine-tuning interest rates to achieve economic growth without inflation.
▪ fine-tune a TV set ▪ fine-tune the temperature of the room ▪ They're fine-tuning interest rates to achieve economic growth without inflation.
