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111 Advanced English Idioms

English Vocabulary Help

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Is Someone as Dumb as a Rock?

A really common idiom is they are just sharp as a tack If you say someone is sharp, it means they're smart. But the opposite of calling someonesharp as a tack And a very offensive phrase. So be careful with this Let's just say that someone is just as dumb as a rock Now, I'm not going to use a person for this example, but you might have seen a dog that just Is stupid.

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