Other than used as a slang, the word "suck" can be used as the followings as well:

Verb:

1. 吸,吮,啜,[O8]
The baby is sucking its finger.
嬰兒在吮吸手指。

2. 吸收(水分);吸取(知識);獲取(利潤)[(+in/up)]
Plants suck up moisture from the earth.
植物從地裡吸收水分。

3. 使捲入,吸引,吞沒[O]
The boat was sucked down into the whirlpool.
船被漩渦吞沒了。

or

吸,吸食,吸吮,吸奶[(+away/at)]
The old man sucked at his pipe.
老人吸著煙斗。

noun:
1. 吸吮,吸食[C]
The baby took one suck at the milk bottle and pushed it away.
嬰兒吸了一下奶瓶就將它推開了。

2. 一口[C][(+of/at)]
She had a suck of orange juice.
她吸了一口橘子汁。