Verb (5-dan, す, intransitive)
1. to run out; to rush out
床にそろえてあった靴を急いで履き、駆け出す。I hurriedly put on the shoes that had been lined up on the floor and rushed out.
2. to start running; to begin to run; to break into a run
じっとしていられなくなり、僕は駆け出した。I couldn't sit still any longer, so I broke into a run.