추석 잘 보내세요.

Chuseok (추석) is one of the biggest traditional holidays in Korea, celebrated on the 15th day of the 8th lunar month. The word '추석' (Chuseok) itself is a compound of '추' (chu), meaning 'autumn', and '석' (seok), meaning 'evening'. So, 'Chuseok' literally translates to 'autumn evening' or 'harvest moon festival', referring to the bright full moon that appears on this day. It is also known as Hangawi (한가위), where '한' (han) means 'big' or 'great', and '가위' (gawi) means 'middle' or 'center', indicating it's a great day in the middle of autumn. The phrase '잘 보내세요' (jal bonaeseyo) is a polite way of saying 'have a good time' or 'spend well'. '잘' (jal) means 'well', and '보내세요' (bonaese-yo) is the honorific imperative form of '보내다' (bonaeda), meaning 'to spend' or 'to send'. Therefore, '추석 잘 보내세요' is a complete well-wishing phrase meaning 'Have a good Chuseok holiday' or 'Spend the Chuseok holiday well'.