Definitions from Wiktionary (tach)

▸ noun:  (obsolete, costermongers) A hat.
▸ noun:  (medicine, colloquial) Tachycardia.
▸ noun:  (informal) Clipping of tachometer. [A device for measuring the revolutions per minute (RPMs) of a revolving shaft, as with the driveshaft of an automobile.]
▸ Also see tach

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