かす
akasu

Godan Verb (su)

1. to pass (the night); to spend

Transitive
Related to 語り明かす
かれ ずに一夜 いちや かした。
karewa nezuni ichiyao akashita.
He sat up all night.
Godan Verb (su)

2. to reveal; to divulge; to disclose; to expose

Transitive
これは秘密 ひみつです。他人 たにん かさないでください。
korewa himitsudesu. taninni akasanaide kudasai.
This is a secret. Keep it to yourself.
Godan Verb (su)

3. to prove; to verify

Transitive
Related to 証す【あかす】