The verb “버리다” means to 1) to throw away, cast away or 2) to finish up, to get it done and when attached to action verbs shows thoroughness or completion. It can also show regret or relief of having done something completely.
Used with action verbs
Negation and /or tense is expressed in the final ~버리다 not the verb that it attaches to
- 빵을 먹어 버렸어요.
- 나중에 읽어 버리겠습니다.
- 어떡해? 버스를 놓쳐 버렸어.