Meaning of “pocket” - Learner’s Dictionary

pocket

verb [ T ] uk us /ˈpɒkɪt/
STEAL

to take something, especially money, which does not belong to you:

His plan was to pocket the money from the sale of the business and leave the country.
PUT IN CLOTHES

to put something in your pocket:

Juan pocketed the knife and walked away.

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