옳소

is right, is correct

→ 옳다
옳 right, correct + 소 Formal polite declarative
adjective Rare #23,825
is right, is correct Old-fashioned, formal-sounding speech; often used to affirm what someone has said.
KO: 그 말이 옳소.
EN: That is right.
Forms of 옳다

그 말이 옳소

You are right.

— 알.이.씨 (2007)

옳소

That's right.

— 보리밭을 흔드는 바람 (2006)

옳소!

Right!

— 보리밭을 흔드는 바람 (2006)

그리고 당신 말이 전적으로 옳소.

And you're absolutely right.