godan verb (-su), transitive verb
Used for demonstrating the truth or validity of something, often in formal or logical contexts. Related to 証する (しょうする), which is a more common suru-verb form.
See also: 証する
彼は自らの無実を証すために証拠を集めた。
He gathered evidence to prove his innocence.
godan verb (-su), transitive verb
Used when giving a firm assurance or pledge, often in a personal or contractual sense. Less common than the proving sense.
品質を証すために、製品には保証書が付いている。
To guarantee the quality, the product comes with a warranty.