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Phrase(s): fine-tune something
1. Lit. to make delicate adjustments in some mechanical or electronic device. • It took a while to fine-tune the flute, but it was worth it. 2. Fig. to make small alterations in a plan or procedure. • We need to spend some time fine-tuning the scheme, then we will seek approval.
McGrawhill's American Idioms And Phrasal Verbs