the boot is on the other foot字面意思是：靴子在另一只脚上；实际含义：情况正好相反；今非昔比；事实恰恰相反。

【例句】
You're not in a position to remove me. The boot is now on the other foot.
你没有权力开除我。事实恰恰相反，我现在可以开除你。

She used to have to obey my orders. The boot is now on the other foot and I have to do what she tells me.
过去她常常要服从我的命令。现如今，情形反过来了，我不得不按她的要求去做。