Translation guide
The English phrase 'red line' can refer to a literal red-colored line, a boundary or limit that should not be crossed, or a specific policy or principle that is non-negotiable. This guide helps learners express these concepts naturally in Japanese.
Please draw a red line on the map.
A compound noun meaning 'red line'. Often used in contexts like editing, marking, or indicating boundaries on documents.
I drew a red line at the corrections.
A point beyond which one should not go; a limit that, if crossed, will trigger serious consequences.
Literally 'a line that must not be crossed'. This is a natural way to express a red line in a figurative sense, emphasizing a strict boundary.
That is a red line that must not be crossed.
A loanword from English, used in political, diplomatic, or business contexts to mean a non-negotiable limit. Common in news and formal discussions.
Means 'boundary line' or 'limit line'. Can be used in technical or formal contexts, but less common for figurative red lines.
A firm stance or rule that will not be compromised, often used in politics, business, or personal values.
While '赤い線' is correct for a physical red line, using it for a figurative boundary can sound unnatural. Use phrases like '越えてはならない一線' or 'レッドライン' instead.
That is a red line.
The government regards that issue as a red line.
We clarified the red line in the negotiations.
Privacy is a red line that must be absolutely protected.