퇴임이 · 퇴임을
retirement from office, leaving office
Example
대통령은 퇴임 후 고향으로 돌아갔습니다.
After leaving office, the president returned to his hometown.
Word parts
퇴 retreat+임 office
Literally 'retreating from office'.
Good to know
Opposite: 취임 (taking office); 퇴임 is a normal end of service, unlike 사임 (resigning).