villain of the piece, the

villain of the piece, the idiom
The person to blame for what is bad or wrong, as in I'm afraid the caterer is the villain of the piece—the food wasn't ready for hours. The piece in this term alludes to a play in which the villain is the character whose evildoing is important to the plot. [Mid-1800s]

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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