明(あ)かすto pass (e.g. the night), to spend, to reveal, to divulge

本心(ほんしん)を明(あ)かすために勇気(ゆうき)を出(だ)す。

Gather courage to reveal one's true feelings. {to pass (e.g. the night), to spend, to reveal, to divulge}

親友(しんゆう)の秘密(ひみつ)を明(あ)かすつもりはありません。

I have no intention of revealing my best friend's secret. {to pass (e.g. the night), to spend, to reveal, to divulge}

被告(ひこく)人(にん)が、法廷(ほうてい)で身(み)の潔白(けっぱく)を明(あ)かそうとしています。

The defendant is trying to prove his innocence in court. {to pass (e.g. the night), to spend, to reveal, to divulge}

長官(ちょうかん)：「スパイは誰(だれ)に対(たい)しても身(み)の上(うえ)を明(あ)かしてはならぬ。」

Chief: 'A spy must not reveal his identity to anyone.' {to pass (e.g. the night), to spend, to reveal, to divulge}

大切(たいせつ)な会議(かいぎ)を欠席(けっせき)するには、欠席(けっせき)の理由(りゆう)を明(あ)かさなければいけないようです。

It seems that you must clarify the reason for your absence if you are going to miss an important meeting. {to pass (e.g. the night), to spend, to reveal, to divulge}