piss on someone's bonfire

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piss on someone's bonfire (third-person singular simple present pisses on someone's bonfire, present participle pissing on someone's bonfire, simple past and past participle pissed on someone's bonfire)

1. (slang, vulgar) To disappoint or discourage someone by ruining or criticizing their plans or aspirations.

   Synonyms: see Thesaurus:put a damper on