wound tighter than an eight day clock

When a person or pet exhibits nervous energy, they are said to be “tightly wound”.
Before electricity, mechanical clocks were wound by turning a key or crank to tighten a mainspring. As the spring would lose tension, the hands would turn for about 8 days before needing to be rewound.

Damn! Did you see how much cocaine Liz snorted? She is going to be wound tighter than an eight day clock this week!

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