go overboard
Show excessive enthusiasm, act in an excessive way. For example, It's easy to go overboard with a new stock offering, or She really went overboard, hiring the most expensive caterer. [Mid-1900s]
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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