Suck

вса́сывать

vsásyvatʹ

((transitive) to use the mouth to pull in (liquid, etc))

отсто́й

otstój

(colloquial: term of general disparagement)

смокта́ть

smoktátʹ

((transitive) to use the mouth to pull in (liquid, etc))

соса́ть

sosátʹ

((transitive) to use the mouth to pull in (liquid, etc))

соса́ть

sosátʹ

((transitive) to put the mouth or lips to (a breast, a mother) to draw in milk)

сосать

sosatʹ

(slang, vulgar: to perform fellatio)