English Idiom - Steal Someone's Thunder
Today's Ginseng English idiom is to steal [someone's] thunder. We use this phrase when one person does something that takes (the stealing) positive attention (the thunder) away from someone who should be getting that positive attention. For example, if it's Alexa's birthday, she should get lots of attention. If Jade announces that she is pregnant at Alexa's birthday, and steals that attention, she steals Alexa's thunder.
Jade really stole Alexa's thunder when she announced that she's pregnant at Alexa's birthday party.
I really wanted to tell everyone about my engagement, but I didn't want to steal Joe's thunder.
My whole childhood, my older sister was always stealing my thunder.