Meaning of “skim” - Learner’s Dictionary

skim

verb us uk /skɪm/ present participle skimming, past tense and past participle skimmed
MOVE OVER [ I, T ]

to move quickly, and almost or just touch the surface of something:

Birds skimmed the surface of the pond.
REMOVE [ T ] also skim off

to remove something from the surface of a liquid:

Skim off any excess fat before serving.
READ QUICKLY [ T ] also skim through

to read or look at something quickly without looking at the details:

She began skimming through the reports on her desk.

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