SHAKE

(WEAKEN) [verb] [T] [past simple] shook, [past participle] shaken - to make less certain or firm or strong; to weakenNo evidence seems to shake their faith in the rightness of their cause.What has happened has shaken the foundations of her belief.After six defeats in a row, the team's confidence has been badly shaken.His unexpected failure has shaken his complacency.This discovery may shake (up) traditional theories on how mountains are formed. [T or M]