Translation guide
How to express 'center line' in Japanese, depending on context: road markings, sports courts, technical drawings, or figurative uses.
The painted line dividing a road into lanes or separating opposing traffic.
Standard term for the center line on a road. Often used in traffic contexts.
中央線を越えて追い越してはいけません。
You must not cross the center line to overtake.
Common loanword from English, widely understood. Slightly more casual than 中央線.
この道路にはセンターラインがない。
This road has no center line.
The line dividing a sports court into halves, e.g., in tennis, basketball, or volleyball.
Used in many sports for the center line of the court.
バレーボールでは、サーブのときにセンターラインを踏んではいけない。
In volleyball, you must not step on the center line when serving.
Also used in some sports contexts, but センターライン is more common.
A line that passes through the center of an object or shape, often used in blueprints or diagrams.
Used in technical drawings, engineering, and geometry to indicate the center axis of an object.
図面に中心線を引いてください。
Please draw a center line on the blueprint.
A central dividing line in abstract senses, such as in politics, opinions, or strategies.
Can be used metaphorically, but often rephrased in Japanese. Use with caution.
彼の意見は常に中央線を狙っている。
His opinions always aim for the center line.
In many figurative cases, Japanese prefers expressions like 中間 (ちゅうかん, middle ground) or 中庸 (ちゅうよう, moderation).
彼は常に中間の立場を取る。
He always takes a middle-of-the-road stance.
中央線 is the standard term for road center lines and some sports. センターライン is a common loanword used in sports and casual road contexts. 中心線 is specifically for technical drawings and geometry. Using the wrong one can sound unnatural.
道路の中央線が消えかかっている。
The center line on the road is fading.
設計図に中心線を記入する。
Mark the center line on the design drawing.
The center line of the tennis court runs under the net.
Sometimes used in casual technical contexts, but 中心線 is more precise.
この部品のセンターラインを基準に組み立ててください。
Please assemble this part based on its center line.