late 14c., "a musical sound, a succession of musical notes," unexplained variant of tone. Meaning "state of being in proper pitch" is from mid-15c.; the verb in this sense is recorded from c.1500. Non-musical meaning "to adjust an organ or receiver" is recorded from 1887. Verbal
phrase tune in in reference to radio (later also TV) is recorded from 1913; figurative sense of "become aware" is recorded from 1926. Tune out "to eliminate radio reception" is recorded from 1908; fig. sense of "disregard, stop heeding" is from 1928. Tunesmith is a U.S. colloquial coinage first recorded 1926.
mod. aware; up-to-date. : Jan is tuned in and alert to what is going on around her.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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