Wiktionary
phone line
n. (n-g lang=en Short for telephone line.)
WordNet
phone line
n. a telephone connection [syn: telephone line, telephone circuit, subscriber line, line]
Usage examples of "phone line".
Claudia Kishi, our vice-president, doesn't really have a lot to do, either, but the rest of us invade her room three times a week and tie up her phone line.
When I tell you about how the club works, you'll see that having a private phone line is very important.