Which one is correct term "Hit & try" or "Hit & trail"?

Question

and more importantly, what is meant by it.

Answer 1

Probably 'hit and try'. It may signify that one keeps attempting to achieve something by repeated effort at random, with limited knowlege of how to succeed.

Answer 2

This may be a peculiarly British phrase. I think it's comparable to the American saying, 'trial and error' meaning to try different approaches to solving a problem with the expectation that many of them will fail before you hit the right one.