be onto a winner

be onto a winner

To be progressing in a way that is likely to succeed. I think we're onto a winner with this new environmental initiative—the whole company has really embraced it. After all of those failed experiments, our team is finally onto a winner now.
See also: winner
Farlex Dictionary of Idioms.

be onto a ˈwinner

(informal) be doing something, especially selling something, that is likely to be successful: He is the sole importer of this product, and he certainly thinks he’s onto a winner.
See also: winner
Farlex Partner Idioms Dictionary
See also:
  • be on the right lines
  • be on the right track
  • be on the right/wrong track
  • on the right track
  • right tack/track, to take/on the
  • on the right tack
  • on the wrong tack
  • on the wrong track
  • be on the wrong track
  • on the right lines