know too much

know too much

cliché To have too much detailed or intimate information (about someone or something) to be allowed to live, lest one divulges that information to someone else. The accountant knows too much about our… less legal sources of income. Eliminate him.
See also: know, much

know too much

be in possession of too much important information to be allowed to live or continue as normal.
See also: know, much