quash

/kwɒʃ/ verb [T]

Definition

CHANGE DECISION formal › to officially change a legal decision so that it stops existing: His conviction was quashed last month.

STOP › to stop something that you do not want to happen: He appeared on television to quash rumours that he was seriously ill.

(Definition of quash verb from the Cambridge Learner's Dictionary © Cambridge University Press)

to do something that spoils someone's plans

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