“Underline” in Japanese
Short answer
Underline in Japanese is “傍線” (bousen). Full meaning: underline, side line (equivalent to underlining in vertically written text).
Other ways to say “Underline” in Japanese
下線
kasen underline, underscore
アンダーライン
andaarain underline
太線
futosen heavy line (for emphasis), thick line, underline, border
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