To place within a fluid (generally a liquid, but also a gas).
Archimedes determined the volume of objects by immersing them in water.
To involve or engage deeply.
To map into an immersion.
To completely enclose or envelop.
To voraciously consume resources, such as money; to devour.
To take over or absorb something (especially an organisation) so it no longer has a separate identity; to assimilate.