Yes, to steal someone's thunder means to take away their shining moment. So, for example, you win an award you have worked really hard for but your friend earns an even bigger award and gets all the praise. They stole your thunder.

This expression is also used when someone takes the excitement out of another person's announcement. For example, if you say to your friend: "My wife just had a baby boy!", your friend might say, "Your mother just stole your thunder. She just phoned and told me an hour ago". I hope this helps.

steal someone's thunder: 1. win praise for oneself by preempting someone else's attempt to impress. preempting: 1. take action in order to prevent (an anticipated event) from happening; forestall. 2. acquire or appropriate (something) in advance. Easier definition (combining both): win praise for oneself by taking action in order to prevent someone else's attempt to impress from happening

it means to take attention away from someone who deserves or wants it. ex. I passed my medical school exam

it means to take attention away from someone who deserves or wants it. ex. I passed my medical school exam, but my sister stole my thunder when she told everyone she was pregnant. (I wanted to get attention for doing something great, but at the same time my sister did something that got all the attention, and I got none.)