Engross

To make gross, thick, or large; to thicken; to increase in bulk or quantity.

To amass.

To copy or write in a large hand (en gross, i. e., in large); to write a fair copy of in distinct and legible characters; as, to engross a deed or like instrument on parchment.

To seize in the gross; to take the whole of; to occupy wholly; to absorb; as, the subject engrossed all his thoughts.

To purchase either the whole or large quantities of, for the purpose of enhancing the price and making a profit; hence, to take or assume in undue quantity, proportion, or degree; as, to engross commodities in market; to engross power.

devote (oneself) fully to; "He immersed himself into his studies"