A long, narrow mark or stripe on a surface (e.g., a stripe on cloth or a drawn line).
そのシャツには細い青い線が入っている。
That shirt has thin blue stripes.
画用紙に鉛筆でまっすぐな線を引いてください。
Please draw a straight line on the drawing paper with a pencil.
古い建物の壁に縦の線模様が残っている。
Vertical stripe patterns remain on the wall of the old building.
A wire or line used for communication or electricity (e.g., telephone line, power line); also used for circuits/connections.
台風で電話線が切れて、電話がつながらなくなった。
The telephone line was cut by the typhoon, and the phone couldn't connect.
工事のために電線が一時的に取り外される。
The power lines will be temporarily removed for construction work.
インターネットは光ファイバー回線で接続されている。
The internet is connected via a fiber-optic line.
A ray or beam of radiation (e.g., X-ray); refers to types of radiative rays or beams.
医者は骨折を確認するためにＸ線を撮った。
The doctor took an X-ray to check for a fracture.
放射線検査では高エネルギーの線が使われることがある。
High-energy rays are sometimes used in radiological examinations.
研究室ではビームラインで実験を行った。
They conducted experiments on the beamline in the laboratory.
A route or track such as a railway line; refers to a transit route, track, or lane (e.g., train line).
毎朝、山手線で会社に通っています。
I commute to work every morning on the Yamanote Line.
新しい地下鉄の線が来年開通する予定だ。
A new subway line is scheduled to open next year.
この港は多くの航路（線）と接続している。
This port connects to many shipping routes.
The outline or contour of a shape; used for drawing outlines or indicating the form of something.
彫刻家はまず作品の線を紙に描いて確かめた。
The sculptor first drew the outline of the work on paper to check it.
このイラストは線が細かくてきれいだ。
This illustration has fine, beautiful line work.
輪郭線をはっきり描くと見栄えが良くなる。
Drawing the contour lines clearly makes it look better.
A level or threshold (e.g., a passing line); a boundary that separates grades, qualifications, or thresholds.
今度の試験の合格線は60点だと発表された。
It was announced that the passing line for this exam is 60 points.
チームは平均点で合格の線をぎりぎり超えた。
The team barely exceeded the passing threshold with their average score.
彼の実力はプロとして通用する線に達している。
His ability has reached the level acceptable for a professional.
A division or boundary; indicates a separating line or demarcation between areas, responsibilities, or categories.
会場には白い線で観客席と演技エリアを区切っていた。
The venue had the spectator area and performance area separated by a white line.
作業の線引きが不明確でトラブルが起きた。
Because the division of tasks was unclear, trouble occurred.
この法律は公と私の線を区別する目的がある。
This law aims to distinguish the public from the private sphere.
A line of action, approach, policy, or principle; often used as in 'to proceed on the line of ~' or 'to take the approach of ~'.
会社はコスト削減の線で事業計画を見直した。
The company reviewed its business plan along the lines of cost reduction.
彼は柔軟な対応の線で交渉に臨んだ。
He approached the negotiations with a flexible policy.
政府は中立の線を保ちながら調整を進めると言った。
The government said it would proceed with adjustments while maintaining a neutral stance.
The impression or aura someone gives; used in expressions like 'has a strong presence' or 'delicate impression' (e.g., 太い線／細い線).
彼女は線が細くて、どこか儚げな雰囲気がある。
She has a delicate look and a somewhat fragile atmosphere.
あの俳優は線が太いので存在感がある役に向いている。
That actor has a strong presence, so he's suited to roles that require it.
初対面では話し方の線で人柄を判断しがちだ。
At a first meeting, people tend to judge character by the way someone speaks.