peg leg 
noun informal
An artificial leg, especially a wooden one.Across from the parrot was a statue of a pirate captain, one eye covered with a patch, his red coat covered in brocade and one of his legs, predictably, replaced by a wooden peg leg....
- Morris was tall and handsome, which helped him cut a swath; in a perverse way, the peg leg apparently helped too.
- I remember seeing him at 4-years-old in Fishgard, Wales with a peg leg and a big top hat.
- keep nit
- keep off
- keep on
- keep on about
- keep on at
- keep one's bed
- keep one's chin up
- keep one's countenance
- keep one's distance
- keep one's eye on (or take one's eye off) the ball
- keep one's eyes open (or peeled or skinned)
- keep one's feet
- keep one's fingers crossed
- keep one's hands clean
- keep one's head
- keep one's head above water
- keep one's head down
- keep one's mouth shut
- keep one's nose clean
- keep one's nose out of
- keep one's nose to the grindstone
- keep one's own counsel
- keep one's powder dry
- keep one's side of the bargain
- keep one's word