(ぼうせん)

ぼうせん
noun
emphasis line drawn beside text; (in horizontal writing) underline
formallanguageeducation
1. emphasis line drawn beside text; (in horizontal writing) underline
A line drawn next to a passage to mark it out. In vertical Japanese writing it runs down the right side of the characters; in horizontal writing it appears as an underline.
傍線(ぼうせん)()
To draw an emphasis line.
I underlined the important parts.
Translate the underlined portion into modern Japanese.

Composed of (ぼう) (beside) + (せん) (line) — literally a line at the side, reflecting vertical writing, where emphasis marks go alongside the characters rather than underneath them.

Common collocations

Usage

Most often met in exam questions and academic quotations, where 傍線(ぼうせん)() ("the marked portion") identifies the passage a question is about. In everyday horizontal text, 下線(かせん) (underline) is the more usual word.