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A person or thing that is strong and coming up fast. You better notice them or they’ll make your life a living hell.
My neighbor just got a new dog. That dog is a force to be reckoned with. It bit my mailman twice.
My cousin’s new ex is a force to be reckoned with. He once broke a chair in half during an argument.
My gym teacher is a force to be reckoned with. He can bench press a cow.