idiom
to cross that bridge when you come to it
問題が発生したときに対処する、事前に心配しない
Meaning
to deal with a problem when it arises, rather than worrying about it beforehand
Example
Don't worry about the meeting next week, we'll **cross that bridge when we come to it**.
来週のミーティングについて心配しないで、**その橋を渡るときに考えよう**。