The most likely meaning of the idiom "we'll cross that bridge when we come to it" is to not worry about a possible problem until it actually happens.
This is a popular idiom that is used by people when a person wants to not think about a particular thing that is likely a problem until he actually faces it.
This refers to the phrase or expression that contains a non-literal or figurative meaning.
Hence, we can see that the most likely meaning of the idiom "we'll cross that bridge when we come to it" is to not worry about a possible problem until it actually happens.
This is because this is used by people when a person wants to not think about a particular thing that is likely a problem until he actually faces it.
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