catch a Tartar

catch a Tartar idiom
Seek out something or someone that turns out to be unexpectedly unpleasant or formidable, as in Now that she finally agreed to meet with you, you just might find that you've caught a Tartar. In this term, Tartar signifies a difficult or sometimes violent individual, referring to Turkic and Mongolian invaders of Asia in the Middle Ages. [Mid-1600s]

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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