Failed is the past tense and past participle of the verb "fail".
Common meanings of failed include:
1. Not successful in achieving a goal or passing a test
2. Stopped working or functioning properly
3. Neglected to do something that was expected or required
4. In business, refers to a company that becomes insolvent
Colloquial expressions with failed:
- "Epic fail" (网络用语): A spectacular failure
- "Fail whale" (网络俚语): Originally from Twitter's error image