I guess it's time for my back-up plan.
Back- up plan( an idiom )
- refers to another plan in case the previous plan doesn't happen.
A: I want to study medicine in Seoul University.
B: Do you have a back-up plan in case you don't get in?
A:Yes, I'm going to marry my boyfriend and I'll be a housewife.
Another similar idiom - Plan B
Make a back-up plan in improving your English skills.
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