Meaning of “soak sth up” - Learner’s Dictionary

soak sth up

phrasal verb with soak us uk /səʊk/ verb [ I, T ]

B2 If a dry substance soaks up a liquid, the liquid goes into the substance:

Fry the potatoes until they soak up all the oil.

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