To reduce by destroying or consuming the vital powers of; to exhaust, as a country of its strength or resources, a treasury of money, etc.
To empty or unload, as the vessels of the human system, by bloodletting or by medicine.
To voraciously consume resources, such as money; to devour.
To completely enclose or envelop.
To take over or absorb something (especially an organisation) so it no longer has a separate identity; to assimilate.