没事儿
Meaning
- to have spare time
- free from work
- it's not important
Example sentence
别客气，没事儿。
You're welcome, it was nothing.
Characters in 没事儿
- 没 méi (negative prefix for verbs) have not; not
- 事 shì matter
- 儿 ér child; the -r ending added to nouns in northern speech
没 not plus 事 matter, with the -r suffix. Nothing is the matter, so it serves as never mind and as being free.