급감rapid decrease; sharp fall; nosedive 급증rapid increase 급행열차express train 긴급emergency 긴급회의emergency meeting 응급실ER; emergency room 초특급being very speedy 특급special express 화급urgency; emergency 구급relief; rescue

낙엽leaf fall 촌락village 추락falling; dropping; plunging 추풍낙엽fallen leaves in the fall 취락settlement; community 타락depravity; degradation 탈락being eliminated; failure 탈락자dropout; eliminated competitor 퇴락dilapidation; going to ruin 폭락plunge; nosedive

세력power; authority 자세posture; pose 증세symptom 추세trend; tendency 태세setup; preparedness 파죽지세irresistible force; crushing power 하락세downward trend; downturn 합세joining forces 허세bluff; brag; ostentation 형세condition; circumstances; situation