首先先来了解一下“分手费”。

分手费指在某些约定情况下，如果卖方在成交前终止协议，卖方应向买方支付的费用，也称为“终止费”。

反向分手费（Reverse Break Fee）也叫反向终止费（Reverse Termination Fee），是指在签署有法律约束力的交易文件后，由于（买卖双方共同约定的）特定事件（“触发条件”）导致买方不能完成拟议交易时，由买方向卖方支付约定金额的费用以补偿卖方因此遭受的损失。在跨境交易中，反垄断审查及各国的外资审查（国家安全审查）是最为常见的触发条件。

相关英文释义如下：A reverse termination fee is also known as a reverse breakup fee. It refers to the amount of money paid to the target company after the acquirer backs out of the deal or the transaction fails to complete. Usually, the reverse termination fee is included in the acquisition agreement, and it can be triggered when the acquirer is unable to obtain the required financing to close the transaction. The purpose of the reverse termination fee is to compensate the target for its time and effort in facilitating the transaction.