倍ばいにして返かえす

expression, godan verb (-su)

repay double; pay back twice the amount

Used when returning a favor, loan, or harm with twice the original value or intensity. Often implies a strong sense of reciprocity.

• 借かりたお金かねは倍ばいにして返かえすと約やく束そくした。

  He promised to repay the borrowed money double.

• 受うけた恩おんは必かならず倍ばいにして返かえすつもりだ。

  I intend to repay the kindness I received twofold.

expression, godan verb (-su)

repay x times the amount

Pattern where 倍 is replaced by a number (e.g., 三倍にして返す) to indicate repaying a multiple of the original amount. The note 'following a number x' indicates this productive use.

• 彼かれは借しゃっ金きんを三さん倍ばいにして返かえすと言いった。

  He said he would repay the debt threefold.