To take credit for someone else's idea or achievement.
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To take the attention away from someone at their big moment.
When you steal someone's thunder, people look at you instead of the person who earned it.
It can be an accident or done on purpose.
"Upstage"
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Drawing attention away from someone else, especially in a performance or public context
"Take the Spotlight"
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Becoming the center of attention in a situation, not necessarily at someone else's expense
"Steal Someone's Thunder"
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Diverting attention or credit away from someone at their own moment