revolving mortgage
A type of mortgage that secures a fluctuating amount of debt up to a maximum limit, commonly used in Japan for ongoing credit lines.
The bank established a revolving mortgage for business funds.
抵当権 is a standard mortgage securing a fixed debt, while 根抵当権 secures a fluctuating debt up to a maximum amount.
Compound of 根 (root, fundamental), 抵当 (mortgage), and 権 (right). The term is a legal coinage reflecting the concept of a 'fundamental' or 'revolving' mortgage right.