immobilize

To render motionless; to stop moving or stop from moving.

It is best to immobilize the injury until a doctor can examine it.

[…]two Russian armies would advance into East Prussia, one westward from the Niemen, the other northward from the Narew, with the object of encircling and immobilizing all enemy forces there.

To render incapable of action.

It's clear from these [budget] cuts that the MCAD is virtually immobilized as an effective organization for at least the next year.

To modify a surface such that things will not stick to it

To tie up a capital: make a capital investment that makes that capital unavailable.

Don't immobilize your capital in aging accounts.