| 1. | the handle of a sword or dagger. |
| 2. | the handle of any weapon or tool. |
| 3. | to furnish with a hilt. |
| 4. | to the hilt, to the maximum extent or degree; completely; fully: to play the role to the hilt. Also, up to the hilt. |

to the hilt
Also, up to the hilt. Completely, to the maximum degree, as in The house was mortgaged up to the hilt. This idiom alludes to the handle (hilt) of a sword, the only portion that remains out when the weapon is plunged all the way in. The figurative use of the term was first recorded in 1687.