Definition of "tach" [tach]

• Informal A tachometer. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "A tach is a useful item when you're trying to coax more miles out of fewer gallons, but they're not easy to come by for us diesel drivers."
• "On the lower tier to the left of the tach is a needle that swings up and down between blue at the top and green at the bottom to let the driver know when the battery is expending power or getting a regenerative charge."
• "Eye - tach - A spoof of V-tach which is short for Ventricular Tachycardia, a life-threatening cardiac arrhythmia."