a dime a dozen
The phrase "a dime a dozen" is an idiomatic expression that means something is very common, abundant, and easy to find. It suggests that the item or object being referred to has little value or uniqueness, similar to something that can be bought for a very low price, like a dime, and is readily available in large quantities.
English is confusing! Why do people say "Pardon my French" when they are speaking English? Because of idioms!
An idiom is a phrase or expression that usually presents a figurative, non-literal meaning attached to the phrase. Does that sound fun? It can be!
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