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Phrase(s): go overboard
1. Fig. to fall out of a boat or off of a ship; to fall overboard. • Be careful or you will go overboard. • Someone went overboard in the fog. 2. Fig. to do too much; to be extravagant. • Look, Sally, let’s have a nice party, but don’t go overboard. It doesn’t need to be fancy. • Okay, you can buy a big comfortable car, but don’t go overboard on price.
McGrawhill's American Idioms And Phrasal Verbs
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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]
American Heritage Idioms