expression, ichidan verb
establish one's innocence; prove oneself right
Used when someone clears their name or proves they were correct, often in a situation of suspicion or accusation.
彼は裁判で身の証を立てた。
He proved his innocence in court.
誤解を解いて身の証を立てる必要
I need to clear up the misunderstanding and prove I was right.
expression, ichidan verb
prove one's identity
Used when someone demonstrates who they are, often in formal or official contexts.
パスポートを見せて身の証を立てた。
I proved my identity by showing my passport.