be (as) right as rain
US /bi əz raɪt əz reɪn/
UK /bi əz raɪt əz reɪn/

1.
완전히 괜찮다, 완전히 회복되다
to be completely well or healthy again after an illness or injury
:
•
After a good night's sleep, I'll be as right as rain.
푹 자고 나면 완전히 괜찮아질 거야.
•
The doctor said he'd be as right as rain in a few days.
의사는 그가 며칠 안에 완전히 괜찮아질 거라고 말했다.