put the mockers on something
put the mockers on (something)
To disrupt, foil, or cause problems to someone's plan, activity, or project. Primarily heard in UK. The caterer cancelled on me at the last minute, which really puts the mockers on this party! It will really put the knockers on our project if the board decides not to increase our funding. You would think the rise of cheap electric cars would put the knockers on Big Oil's profits, but they actually seem to be embracing the change.
put the mockers on somethingBRITISH, OLD-FASHIONED
If someone or something puts the mockers on something, they prevent it from happening or from being successful. The sending-off of Simon Walker after only 10 minutes certainly put the mockers on any thought of an English victory. Note: The origin of this expression is uncertain, but some people think that `mockers' may come from Yiddish.