The hilt of a knife, dagger, sword, or bayonet is its handle, consisting of a guard, grip and pommel. The guard may contain a crossguard or quillons. A tassel or sword knot may be attached to the guard or pommel.

What does the expression to the hilt mean?

to the hilt. 1 : to the very limit : completely the farm was mortgaged to the hilt.

What does back you to the hilt mean?

To the hilt and up to the hilt mean to the maximum extent possible or as fully as possible. [informal, emphasis] The men who wield the power are certainly backing him to the hilt.