广义而言，default是指不履行按合约所承诺的义务，多指
债务人不履行还本付息的义务，通常由债权人宣布
债务人违约。
Failure to meet an obligation such as a payment of interest or
principal. Technically, the borrower does not
default. The initiative comes from the lender who declares the borrower is in default.
