English Idiom · Intermediate
big one
an important event, challenge, or achievement
Pronunciation: say big one
Meaning
An important, significant, or major event or achievement.
Example
We have won smaller matches, but tomorrow's final is the big one.
We have won smaller matches, but tomorrow's final is the big one.
Practice tips
- Practice big one out loud — read the pronunciation guide above and repeat.
- Use it in your own sentence today; reuse beats rereading.
- Pay attention to context: this English idiom is for intermediate-level learners.