상하up and down 하수sewage 하숙비payment for board and lodgings 영하temperature below zero 지하basement 지하도underground tunnel 지하철subway 지하철역subway station 하bottom; lowest 하강fall; descent

계단stairs; staircase 교통수단means of transportation 구구단multiplication table 단계phase; step 수단means; method 특단being special 계단식being step-like; be terraced; being tiered 고단수high-level trickster 다단multilevel; multistage; multiple columns 다단계multilevel; multistage; pyramid