This is the 15253rd most frequent Korean word.
배수
"배수" means "drainage" or "multiple" depending on context.
In this sentence, '배수' refers to the drainage system or removal of water.
그 도로에는 배수 시설이 잘 갖추어져 있습니다.
The road has well-equipped drainage facilities.
Here, '배수관' combines '배수' (drainage) with '관' (pipe), indicating a drainpipe specifically.
운동장에서 배수관이 막혔어요.
The drainpipe in the gymnasium is clogged.
In this example, '배수' is used in the numerical sense to denote a multiple or magnification factor (two times).