noun
leased telephone line
A telephone line provided under a lease agreement, typically for business or dedicated use.
会社は電話線貸与を契約して専用回線を確保した。
The company contracted a leased telephone line and secured a dedicated circuit.
Compound of 電話線 (telephone line) + 貸与 (loan, lease). The exact historical derivation is uncertain; the term is a straightforward modern technical compound.