We found 2 dictionaries that define the word be onto a winner:

General (1 matching dictionary)

Miscellaneous (1 matching dictionary)

1. be onto a winner: Idioms

▸ Words similar to be onto a winner ▸ Usage examples for be onto a winner ▸ Idioms related to be onto a winner ▸ Wikipedia articles (New!) ▸ Words that often appear near be onto a winner ▸ Rhymes of be onto a winner ▸ Invented words related to be onto a winner