prosdapanao denotes spending an additional amount in the promise to repay further costs.

The sole attested use concerns an additional expense beyond the two denarii already given: in Luke 10:35, the aorist active subjunctive occurs in the innkeeper's care of the wounded man, with repayment promised for whatever further amount is spent.

1. incur an additional expense · dominant

   In Luke 10:35, προσδαπανήσῃς is a second-person aorist active subjunctive in the statement about caring for the man after two denarii have been given. The APB renders the clause, "and whatever more you spend I will repay you when I return," confirming that the action concerns further outlay subject to repayment.

   Luke 10:35

In the Anselm Project Bible: In Luke 10:35, the APB presents the clause as "whatever more you spend,".