환절기 [ hwanjeolgi ]
In 환절기, 환 means ‘to change’, 절 means ‘joint’ or ‘node’, and 기 means ‘time’. Here, 절 is from 계절, which means ‘(a) season(s)’.
환절기 means ‘changing season‘. Koreans say words with 환절기 a lot to wish others’ well-being during changing seasons since the temperature changes drastically.
환절기 감기 조심하세요. (Don’t catch a cold in this changing season.)
환절기 건강 조심하세요. (Please take care during this changing season.)