To take credit for someone else's idea or achievement.
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To take attention or credit away from someone by doing something that overshadows them at their moment.
When you steal someone's thunder, you draw focus to yourself at a time when another person should be the center of attention.
It is used when one person's actions unintentionally or deliberately upstage another.
"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