— PHRASES put the mockers on (something) Brit. Informal
— 1 put an end to.
— 2 bring bad luck to.
To put the mockers on something is to spoil its chances of success, to put a curse on it. You would put the mockers on something for example, by saying that the weather has been wonderful all week and then hoping that it will be a sunny weekend, thereby jinxing yourself, condemning you to a weekend of rain and thunderstorms!
The word Mockers is slang of indeterminate origin (possibly Romany or Yiddish) meaning misfortune, a curse or frustration.
Suggested usage: The new time recording system installed by the firm has put the mockers on making an early escape for the weekend