1.
phone extension, internal line
An internal telephone line within an organization, or the extension number used to reach a specific phone.
内線番号は何番ですか。
What is your extension number?
内線で担当者に繋ぎます。
I'll connect you to the person in charge via the internal line.
Business context
内線1234番にかけてください。
Please call extension 1234.
2.
civil war, internal conflict
A war or armed conflict within a country.
その国は長い内線に苦しんだ。
That country suffered through a long civil war.
内線が終わった後、国の復興が始まった。
After the civil war ended, the country's reconstruction began.
内線により多くの人々が国外に逃げた。
Many people fled the country due to the civil war.
USAGE: 内線 most commonly refers to telephone extensions in offices and organizations. The second meaning (civil war) is used in historical and political contexts.
COMMON PATTERNS:
- 内線番号 (extension number)
- 内線で電話する (to call on the internal line)
- 内線XXXX番 (extension number XXXX)
CONTRAST:
- 内線 - internal line (within organization)
- 外線 - external line (outside calls)