steal someone's thunder

「出し抜く」。誰かが華やかに何かをしようとしているのを、先取りして実現してしまう、という感じ。

ipadio to release killer iPhone app for audio broadcasting on TechCrunch

However, a new entrant, ipadio, is potentially about to steal AudioBoo’s thunder with a new iPhone app which covers all the bases: live streaming audio into a web page; high quality uploads from the iPhone; live phone-in service; upcoming Android app - plus, crucially, a business model.