Russian

Interjection

не́ за что • ‎(né za što), literally: for nothing

1. Used other than as an idiom: see не ‎(ne),‎ за ‎(za),‎ что ‎(što).
2. you're welcome, not at all, don't mention it
3. not worth mentioning, nothing to speak of
4. no problem

See also

• ни за что́ ‎(ni za štó)