Literally, a double-edged sword is a sword that has two sharpened edges. Figuratively, double-edged sword refers to something that has both good and bad consequences. When you’re wielding a double-edged sword, you have to be careful that you don’t cut yourself when you’re trying to swing it at an opponent. Such a sword can be helpful (in striking your opponent) and harmful (if you strike yourself). If something is a double-edged sword, it will help you or be good for you but will also most likely hurt you or have a harmful cost. Example: My new car is a double-edged sword, getting me to work but costing me a lot of money in gas and insurance.
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