A staff with a crosspiece fitting under the armpit, as for support in walking; any mechanical device of similar shape.
The crutch had been left at the entrance, well hidden. – Then Marched the Brave by Harriet T. Comstock
Some of them had a sleeve lying limp now, or walked with a crutch, or even on a wooden leg, but it was, all the same, " Nichevo!" – The Secret of the Night by Gaston Leroux