The Only Use of

limber

in

The Adventures of Huckleberry Finn

Here's a govment that calls itself a govment, and lets on to be a govment, and thinks it is a govment, and yet's got to set stock-still for six whole months before it can take a hold of a prowling, thieving, infernal, white-shirted free nigger, and—" Pap was agoing on so he never noticed where his old limber legs was taking him to, so he went head over heels over the tub of salt pork and barked both shins, and the rest of his speech was all the hottest kind of language—mostly hove at the nigger and the govment, though he give the tub some, too, all along, here and there.†
Chpt 6

limber = make flexible

Definition:

of a person's body: flexible (capable of moving, bending, and stretching easily)

or:

readily adaptable -- especially of someone's mind