1
to breathe in;to inhale;to smoke (a cigarette, etc.)
教室でどうどうとタバコをすう高校生たちとそれを注意できない教師たちは罰を受けることになります。
High school students who flagrantly smoke in class and the teachers who can't caution them will be punished.
2
to suck;to sip;to slurp
3
to absorb;to soak up
この紙はインクを吸わない。
This paper does not absorb ink.
4
to kiss
Other forms
喫う 【すう】 (rarely used kanji form)