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- upset the applecart
upset the applecart
upset the applecart
to cause trouble, especially by spoiling someone's plans I don't want to upset the applecart now by asking you to change the date for the meeting.
upset the applecart
Spoil carefully laid plans, as in Now don't upset the applecart by revealing where we're going. This expression started out as upset the cart, used since Roman times to mean "spoil everything." The precise idiom dates from the late 1700s.