to inhale; to breathe in; to suck up; to soak up; to absorb
to swallow up (in a crowd, whirlpool, the darkness, etc.); to suck in
新鮮な空気を思い切り吸い込んだ。
I took a deep breath of fresh air.
掃除機がカーペットのほこりを吸い込んでいる。
The vacuum cleaner is sucking up dust from the carpet.
スポンジが水を吸い込んで膨らんだ。
The sponge absorbed water and expanded.