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peter out

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Dwindle or diminish and come to an end, as in Their enthusiasm soon petered out. The origin of this usage is unknown, but one authority suggests it may refer to the apostle Peter, whose enthusiastic support of Jesus quickly diminished so that he denied knowing him three times during the night after Jesus's arrest. [Mid-1800s]

QUIZ
SHALL WE PLAY A "SHALL" VS. "SHOULD" CHALLENGE?
Should you take this quiz on “shall” versus “should”? It should prove to be a quick challenge!
Question 1 of 6
Which form is used to state an obligation or duty someone has?
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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