Now, Buße means "repentance," "penance," "fine," or "damages." It actually has a direct cognate in English:
G Buße < OHG buoza < Gmc *bōt- > OE bōt > E boot.
No, not the footwear boot but the commercial term:
Cash or other property added to an exchange or a transaction in order to make the value of traded goods equal.Whence comes phrase "to boot."