Etymology
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tune-up (n.)

"adjustments made to an automobile to improve its working," 1911, from verbal phrase tune up "bring to a state of effectiveness," 1718, in reference to musical instruments, from tune (v.) + up (adv.). Attested from 1901 in reference to engines. Meaning "event that serves as practice for a later one" is from 1934, U.S. sports jargon.

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Definitions of tune-up

tune-up (n.)
exercising in preparation for strenuous activity;
Synonyms: warm-up / prolusion
tune-up (n.)
adjustments made to an engine to improve its performance;
From wordnet.princeton.edu