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What are some idioms that no longer make sense? Can you think of a modern replacement?
A stitch in time saves nine.
This refers to a time when clothes were hard to come by and often homemade. If they tore, a small tear could be fixed with one stitch of needle and thread, but if let go too long, it would take many more stitches to repair a bigger rip.
Change your oil (or tires) in time, or change your car.