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Also, cross that bridge when you come to it. Deal with a situation when, and not before, it occurs. For example, If we can't sell the house? well, we'll cross that bridge when we come to it. The ultimate origin of this proverb, a caution not to anticipate trouble and often put as don't cross a bridge till you come to it, has been lost. The earliest recorded use is in Henry Wadsworth Longfellow's The Golden Legend (1851): "Don't cross the bridge till you come to it, is a proverb old and of excellent wit."
American Heritage Idioms