Definition
This idiom means to postpone worrying about a potential problem until it actually occurs.
"What if we can't find enough sponsors?" "Don't worry, we'll cross that bridge when we come to it. I am sure we will figure something out by then."
I know you’re worried about the upcoming merger, but we'll cross that bridge when we get to it. Let’s focus on what we can control for now.
"What if it rains next week?" "We'll cross that bridge when we come to it. For now, let's just focus on the present."