expression, godan verb (-u, special)
appeal to someone's trust; question someone's credibility
A formal, somewhat literary expression used when challenging or testing whether someone is trustworthy, often in political or ethical contexts.
彼の行動は、我々の信を問うものだ。
His actions call our trust into question.
リーダーは国民の信を問う
The leader called an election to test the people's confidence.