折合抵偿to set off against

• 判决执行以前羁押的日期，以羁押一日折抵刑期一日。

  Taking the date of custody prior to sentencing, one day in custody cancels out one day of prison time.

• 他以该奖券已折抵借款、无权回赎为由而拒绝。

  He refused the request claiming that the lottery ticket had already been set off against the loan and could not be redeemed.