it's now or never
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now or never
At the current time or not at all. Said of an action that must be done now or will not be able to be done in the future. Once we start our careers, it will be harder and harder to take a backpacking trip like this. It's now or never! If you have to go to the bathroom before we get back on the road, go now, because it's now or never!
*now or never
at this time and no other. (*Typically: be ~; become ~.) This is your only chance, John. It's now or never. I decided that it was now or never, and jumped.
now or neverused to convey urgency.
1994 James Kelman How Late It Was, How Late It's now or never, know what I'm saying; he's out this once, there's no gony be a second time.