/ˌfaɪn ˈtuːn/

fine-tune

BrE /ˌfaɪn ˈtjuːn/

NAmE /ˌfaɪn ˈtuːn/

~ sth

to make very small changes to sth so that it is as good as it can possibly be

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fine-tuning

BrE /ˌfaɪn ˈtjuːnɪŋ/

NAmE /ˌfaɪn ˈtuːnɪŋ/

[U]

The system is set up but it needs some fine-tuning.