Meaning of “suck” - Learner’s Dictionary

suck

verb uk us /sʌk/

[ I, T ] to have something in your mouth and use your tongue, lips, etc to pull on it or to get liquid, air, etc out of it:

to suck a sweet/lollipop
to suck your thumb
suck sth in/under/up, etc

to pull something somewhere using the force of moving air, water, etc:

He was sucked under the boat and drowned.
be sucked into sth

to become involved in something bad when you do not want to

he/it/this, etc sucks! US very informal

If someone or something sucks, they are bad or unpleasant.

(Definition of “suck” from the Cambridge Learner’s Dictionary © Cambridge University Press)