now or never, it's

1. It must be done now or not at all, as in If you plan to state your case to the boss, it's now or never. This phrase was first recorded in 1560.

Example Sentences

If it’s not now or never, it’s getting close.

Read more on Los Angeles Times

I thought: 'Hey, it's now or never, it's an opportunity that destiny has offered and we have to take advantage of it.'

Read more on BBC