Amass means to accumulate or gather for oneself.
Amass is a verb.
Synonyms: compile, acquire, assemble, collect.
Antonyms: dispense, distribute, scatter, disperse.
My friend amassed a great fortune; he accumulated a lot of wealth from several wise share investments.
Over the past ten years Mr.Ravi has amassed an impressive collection of coins.
Mr.Ravi worked diligently and amassed such a large fortune that he decided to retire at the early age of fifty.