6 letters · 10 points in Scrabble
noun a two-wheeled horse-drawn vehicle used to pull a field gun or caisson
verb attach the limber
verb cause to become limber
originUnknown; possibly related to limb or limp + -er, as seen in clever, slipper (“slippery”), waker (“alert”), etc.
Etymology from Wiktionary, CC BY-SA 3.0