rubber

/ˈrʌbər/ noun

Definition

SUBSTANCE [U] › a strong material that bends easily, originally produced from the juice of a tropical tree, and used to make tyres, boots, etc

PENCIL [C] UK (US eraser) › a small object which is used to remove pencil marks from paper

(Definition of rubber noun from the Cambridge Learner's Dictionary © Cambridge University Press)

to do something that spoils someone's plans

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