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to do what someone else was going to do before they do it, especially if this takes success or praise away from them
"Stealing someone's thunder" means to take credit from someone else's work or accomplishments to your own benefit.
The phrase comes from the English stage. An actor-manager had invented a machine to produce the sound of thunder. (An earlier solution was to roll dried peas around on a drum.) His play closed, and he was outraged when he attended a production of Macbeth and heard his machine being used. According to legend, he stood up and shouted ‘Damn them! They will not let my play run, but they steal my thunder.’
http://blog.oxforddictionaries.com/2011/12/stealing-someones-thunder/
To take credit for someone else's efforts.
