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pull the plug on

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1

Discontinue, end, as in The government pulled the plug on that program. [First half of 1900s]

2

Remove all life-supporting equipment, as in The family debated whether it was time to pull the plug on him. [Second half of 1900s] Although this idiom undoubtedly alludes to cutting off electricity to an electrical device, it originally referred to the removal of a stopper that flushed an old-style toilet.

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ARE YOU A TRUE BLUE CHAMPION OF THESE "BLUE" SYNONYMS?
We could talk until we're blue in the face about this quiz on words for the color "blue," but we think you should take the quiz and find out if you're a whiz at these colorful terms.
Question 1 of 8
Which of the following words describes “sky blue”?
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The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.

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