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cross that bridge when one comes to it

  1. to deal with a problem later
L311061 on Wikidata ↗

Wiktionary

verb

Etymology: A metaphor for an idea being like a train of thought and the problem being like the bridge.

  1. To deal with a problem or situation only if and when it arises.

    It's possible we'll eventually have more books than available space for them, but we'll cross that bridge when we come to it.

    They might be willing to admit, OK, yeah, if you invent superintelligence, things will probably be crazy. But I’ll cross that bridge when we come to it.