queer somebody's pitch

queer the/(one's) pitch

To ruin, spoil, or undermine one's efforts, plans, or ideas. Primarily heard in UK. The president's recent decision to back out of the trade agreement has queered the pitch for many companies seeking to enjoy lower export-import costs. I fear that sticking to an inflexible agenda may queer our pitch as we head into general elections.
See also: pitch, queer

queer somebody’s ˈpitch

,

queer the ˈpitch (for somebody)

(British English, informal) spoil somebody’s plans or their chances of getting something: Somebody must have told her boss about her plans to leave. Who was trying to queer her pitch?
See also: pitch, queer