Steal (someone's) thunder

Translation steal (someone's) thunder into russian

She didn't want to announce her promotion at the party because she didn't want to steal her friend's thunder.

Она не хотела объявлять о своем повышении на вечеринке, потому что не хотела украсть славу своей подруги.

To take credit for someone else's idea or to preemptively use their idea or advantage, often in a way that diminishes their impact or recognition.