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what makes one tick

 
Idioms: what makes one tick

What makes one function characteristically, what motivates one, as in We've never figured out what makes these chess players tick. This expression alludes to tick in the sense of "function as an operating mechanism, such as a clock." [Colloquial; first half of 1900s]


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Idioms. The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Company. All rights reserved.  Read more