指在外汇黑市交易中，倒汇人玩弄手段从换汇人应得的数额中扣下一部分钱to shortchange someone in a black market currency exchange

• 许多人到黑市上兑换美元，都受过“切汇”的坑害。

  Many people who go to change U.S. dollars on the black market are shortchanged.

• 一些不法之徒针对银行客户进行诈骗、调包、切汇。

  Some criminals target bank customers as victims, carrying out fraud, stealthily substituting one thing for another, and shortchanging them when exchanging money.