裏書

(1)any factual evidence that helps to establish the truth of something; "if you have any proof for what you say, now is the time to produce it"

(2)何かの真実を確立するのに役立つ、事実に基づく証拠

(3)a signature that validates something; "the cashier would not cash the check without an endorsement"

(4)何かを有効にする署名

(5)the act of validating; finding or testing the truth of something

(6)有効にする行為

(7)何かの真実を見つけたり検証したりすること