Definition of “steal sb's thunder” - English Dictionary

british dictionary

“steal sb's thunder” in British English

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steal sb's thunder

to do what someone else was going to do before they do it, especially if this takes success or praise away from them:

Sandy stole my thunder when she announced that she was pregnant two days before I'd planned to tell people about my pregnancy.

(Definition of “steal sb's thunder” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)