limber (adj.) Look up limber at Dictionary.com
1565, of uncertain origin, possibly from limb on notion of supple boughs of a tree, or from limp "flaccid," or somehow from M.E. lymer "shaft of a cart" (see limber (n.)).
limber (n.) Look up limber at Dictionary.com
"detachable forepart of a gun carriage," 1480, probably related to Fr. limonière "wagon with two shafts," from limon "shaft," probably of Celtic origin.