There are several synonyms for the phrase "fills one's pockets", which is commonly used to describe an increase in wealth or financial gain. Some of the synonyms include "fills one's coffers", "lines one's pockets", "pads one's wallet", "bolsters one's bank account", "builds one's nest egg", and "enriches one's wallet". Other phrases that can be used to express a similar idea include "boosting one's income", "securing financial success", and "accumulating wealth". Although these phrases may differ in wording, they all describe a favorable financial situation that results in increased financial security and potential for future success.