Breakage costs
The Jolly Contrarian’s Dictionary The snippy guide to financial services lingo.™

Breakage costs /ˈbreɪkɪdʒ kɒsts/ (n.)
1. (Loans) The opportunity cost to a lender of a borrower repaying a loan before its stated maturity, arising because the lender must unwind its interest rate hedges  usually the difference between the rate payable on the loan for the specified period and the overnight rate. The difference between the present value of the remaining loan repayments at their stated rate and their present value at the prevailing market rate — that is, the difference between present value of what I would get if we stuck with the original deal and you repaid the loan at term, and how much I could get if I lent that money out today, at today’s rate, for the period of the remaining term on the original loan.
2. (Swaps) the net present value of the remaining cashflows on a swap. On the trade date those values must have been equal and on any other day swap break costs will generally be simply the uncollateralised marktomarket value, or the replacement cost, of the existing transaction. You could also reach that conclusion by going through the motions:
 If I terminated this swap today, what would its MTM be? This is the equivalent of “the present value of the remaining payments".
 If I traded a new swap at today’s prices, what would its MTM be? According to the theory of homo economicus, this ought to be necessarily zero — any other value would mean I was entering into an offmarket swap.^{[1]}