v.tr.1. a. To draw (liquid) into the mouth by movements of the tongue and lips that create suction.
b. To draw a liquid into the mouth through or from: a baby sucking a bottle.
c. To hold, moisten, or maneuver (a sweet, for example) in the mouth, especially in creating suction.
2. a. To draw in by establishing a partial vacuum: a cleaning device that sucks up dirt; sucked air into his lungs.
b. To draw in a current in a fluid: debris that got sucked into the drain.
c. To cause to be involved or engaged in something: teenagers who are sucked into a life of crime.
3. Vulgar Slang To perform fellatio on.
v.intr.1. To move the tongue and lips to create suction: sucked on a straw.
2. To draw something in by suction: The pump started to suck.
3. To draw nourishment from a breast or teat; suckle.
4. To make a sound caused by suction.
5. Slang a. To be highly unpleasant or disagreeable: This job sucks.
b. To be of poor or inferior quality: The acting in that movie sucked.
c. To be inept: I suck at math.