what makes smb. (or smth.) tick

   paзг.

   чeм oбъяcнить eгo (eё и т. д.) пoвeдeниe, чтo им (eю и т. д.) движeт (тo, чтo зacтaвляeт чтo-л. функциoниpoвaть)

    I want to know lots of people and see what makes them tick (I. Murdoch). I've studied psychology, you see, so I know what makes everyone tick (M. Dickens) (and)