cross that bridge when (one) comes to it
To address something only when it actually happens or becomes an issue. A: "Do you know if that road is still closed?" B: "No, so I guess we'll have to cross that bridge when we come to it." The job interview is a week away, so I'm not worried about it yet—I'll cross that bridge when I come to it.
cross that bridge when one comes to it
Fig. to delay worrying about something that might happen until it actually does happen. (Usually used in the phrase, "Let's cross that bridge when we come to it," a way of telling someone not to worry about something that has not happened yet. Alan: Where will we stop tonight? Jane: At the next town. Alan: What if all the hotels are full? Jane: Let's cross that bridge when we come to it.