To rest 

휴일 = day off, public holiday
휴가 = break, vacation (from work)
휴식 = rest, break
휴학 = temporary absence from school
연휴 = consecutive holidays (추석연휴)
휴게소 = a resting place, a (highway) rest stop
휴전선 = a truce line
휴화산 = a dormant volcano
공휴일 = national holiday
휴강 = skipping a class, class cancelled 
휴무 = day off