Definition of steal someone's thunder
- I didn't mean to steal your thunder, but I just had to tell your mom about your promotion.
: to take the property of another wrongfully and especially as a habitual or regular practice
: to come or go secretly, unobtrusively, gradually, or unexpectedly
: to steal or attempt to steal a base
: the act or an instance of stealing
: a fraudulent or questionable political deal
: some person : somebody
: the sound that follows a flash of lightning and is caused by sudden expansion of the air in the path of the electrical discharge
: bang, rumble
: a loud utterance or threat
: to produce thunder
: to give forth a sound that resembles thunder
: roar, shout
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