Meaning:

You use this proverb to tell someone not to worry about something until it actually happens.

People often say "I/We will cross that bridge when I/we come to it" to mean they will not worry about the particular possible problem until it actually appears.

Example:

A: Our proposal is ready, but what if the committee doesn't accept it?
B: Don't cross your bridges before you come to them. We will see what happens then.

A (woman): I'll introduce you to my parents tonight.
B (the woman's boyfriend): Okay.., but they might not like me.
A: Don't worry. We'll cross that bridge when we come to it.

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