to the hilt

to the hilt or up to the hilt  {adv. phr.}

To the limit; as far as possible; completely.

The other boys on the team told Tom he couldn't quit. They said, "You're in this to the hilt."

The Smith's house is mortgaged up to the hilt.

Compare:

HEART AND SOUL,

TO THE FULL,

UP TO THE --- IN.