회신이 · 회신을 · 회신하다 (to reply)
reply, response (formal, e.g. to an email)
Example
확인하시고 회신 부탁드립니다.
Please check and reply.
Word parts
회 return+신 letter, message
Literally 'returning letter'.
Good to know
A formal word for business emails and official letters; with friends use 답장.
Related words