ichidan verb, intransitive verb
escape successfully; get away; manage to flee
Emphasizes the successful completion of an escape, often after effort or difficulty. The auxiliary おおせる adds the nuance of 'managing to do something completely'.
犯人は警察の包囲網から逃げおおせた。
The criminal managed to escape from the police cordon.
彼は追っ
He succeeded in getting away from his pursuers.