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A high-performance automobile with a large, powerful engine designed for quick acceleration and high straight-line speed. A: "I can't believe that Grandpa had a muscle car when he was in his 20s!" B: "Oh, he sure did. He liked to hit the road and go fast." You could do some serious street racing with a muscle car like that.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.