As always happened with him during his solitude, a mass of ideas and feelings had been accumulating within him, which he could not communicate to those about him.
Anna, left alone, spent the time till dinner in assisting at her son’s dinner (he dined apart from his parents) and in putting her things in order, and in reading and answering the notes and letters which had accumulated on her table.
There are no more uses of "accumulate" in the book.
Show samples from other sources
Dr. Finch became a bone man, practiced in Nashville, played the stock market with shrewdness, and by the time he was forty-five he had accumulated enough money to retire and devote all his time to his first and abiding love, Victorian literature, a pursuit that in itself earned him the reputation of being Maycomb County’s most learned licensed eccentric.
Harper Lee -- Go Set a Watchman
Thomas kept coughing and rubbing chunks of accumulated grime from the corners of his eyes.