Something is very common and easy to find.
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To describe something so common that it has little value or special appeal.
When you say something is a dime a dozen, you mean there are plenty of them around — they’re nothing special.
It’s often used to dismiss something or someone who isn’t as unique as they think.
"Run of the Mill"
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Ordinary and average in quality, not special or exciting
"Ten a Penny"
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Very common and of little value, the British equivalent
"A Dime a Dozen"
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Very common and not worth much because of it