To pass or spend the night (often used in the expression 夜を明かす: to stay up all night or spend the night).
試験勉強で友人と一緒に夜を明かした。
I spent the night with friends studying for the exam.
登山のため山小屋で一晩を明かした。
We spent a night in the mountain hut for the climb.
To reveal, divulge, or disclose information, a secret, or the truth.
彼はついに事件の真相を明かした。
He finally revealed the truth about the incident.
彼女は友人にだけ秘密を明かした。
She revealed the secret only to her friend.
調査報告書で多くの不正が明かされた。
Many acts of misconduct were exposed in the investigation report.
To prove or verify something; to make clear and demonstrate its truth.
新しいデータが理論の正しさを明かした。
The new data verified the correctness of the theory.
彼のアリバイを証拠で明かすことができた。
We were able to verify his alibi with evidence.