裏付ける うらづける to support (a theory, claim, etc.) #17,662 Meanings ichidan verb, transitive to support (a theory, claim, etc.); to back up; to substantiate; to prove Its kanji 裏 リ · うら back, amidst, in, reverse, inside, palm, sole, rear, lining, wrong side 付 フ · つ.ける、-つ.ける、-づ.ける、つ.け、つ.け-、-つ.け、-づ.け、-づけ、つ.く、-づ.く、つ.き、-つ.き、-つき、-づ.き、-づき adhere, attach, refer to, append