what makes (someone) tick

idiom

Definition of what makes (someone) tick

informal
: the things that cause someone to behave a certain way : the feelings, opinions, concerns, etc., that are parts of someone's personality I've always wondered what makes people like that tick.

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“What makes (someone) tick.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/what%20makes%20%28someone%29%20tick. Accessed 27 Oct. 2020.

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