tv. to put an end to someone or something as a problem; to defuse a problem caused by someone or something. (As if one were disconnecting an electrical appliance.) : I've heard enough from Mr. Jones. It's time to pull the plug on him.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw-Hill Education.
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pull the plug
prevent from happening or continuing; "The government pulled the plug on spending"