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Use "monkey-wrench" in a sentence
"His life was luxurious yet humble, and when he's thrown the mother of all curve balls -- more of a monkey-wrench -- he has to face a hard life while still being surrounded by an idyllic setting and more money than he can shake a stick at."
"It's just that it can have an insidious way of throwing a monkey-wrench in my initial plans for a story."
"The obligatory monkey-wrench comes in the form of the apparent resurrection of Blackwood from the grave and a new plot to bring London to its knees."