steal somebody's thunder
steal (one's) thunder
1. To divert attention or praise away from someone else or their accomplishments and toward oneself. My brother is the star athlete of our high school, so no matter what I succeed in, he's constantly stealing my thunder.
2. To steal someone's idea, plan, or patent and use it for one's own advantage. We had the idea for "digital paper" years ago, but I see they've stolen our thunder and have their own version of it on the market.