1 [intransitive and transitive]
to take air, liquid etc into your mouth by making your lips form a small hole and using the muscles of your mouth to pull it in
suck something in
Michael put the cigarette to his lips and sucked in the smoke.
a baby sucking at its mother's breast
suck something up
Jennie sucked up the last bit of milkshake with her straw.
2HBH [intransitive and transitive]
to hold something in your mouth and pull on it with your tongue and lips:
Don't suck your thumb, dear.
a picture of Lara sucking on a lollipop
to pull someone or something with great power and force into or out of a particular place
suck something into something
A bird was sucked into one of the jet's engines.
suck somebody/something under/down
The river sucked him under.
suck something out of/from something
The fluid was sucked from his lungs.
4 spoken not polite
used when you dislike something very much or think something is very bad:
• If you ask me, the whole thing sucks.
5 British English informal
to use something or do something for a short time, to find out if it works, if you like it etc
be sucked inphrasal verb
The US has no intention of getting sucked into another war in Europe.
suck upphrasal verb
suck up to
He's always sucking up to the boss.