Don't upset the applecart计划;安排被某人打乱
PHRASE（习语） If you upset the applecart, you do something that causes a plan, system, or arrangement to go wrong. 破坏计划; 扰乱制度; 打乱安排
They may also be friends of the chairman, so they are reluctant to upset the applecart.
他们也可能是主席的朋友，所以他们不愿从中捣乱。