“Legally speaking” in Japanese
Short answer
Legally speaking in Japanese is “本来であれば” (honraideareba). Full meaning: by all rights, legally speaking, properly speaking.
Other ways to say “Legally speaking” in Japanese
本来から言えば
honraikaraieba by all rights, legally speaking, properly speaking
法律上
houritsujou legal, from a legal standpoint, legally speaking, de jure
本来なら
honrainara by all rights, properly speaking, legally speaking
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