They really went overboard with the party preparations.
An example of overboard is a how someone’s sunglasses fall when someone drops them off the side of the cruise ship; dropped overboard.
An example of overboard is extravagantly celebrating a coworker’s birthday; going overboard with a celebration.
- To go to extremes, especially as a result of enthusiasm.
- to go to extremes; esp., to be wildly enthusiastic
- to discard