upset the apple-cart意为“打乱秩序；把事情搞糟；拆人台”。

【例句】
He has completely upset the apple-cart by taking his holiday three days earlier than he said he would.
他比他说的提前了三天去休假，因此，完全打乱了计划。

Tom really upset the apple cart by telling Mary the truth about Jane.
汤姆把珍妮的真实情况告诉了玛丽，他可真把事情给搞砸了。