limber leg meaning in Chinese

软腿病

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
爸爸就是这么滔滔不绝，可就是从没有想一想自己那两条有气无力的老腿把他带到了何方，这样，他给腌猪肉的木桶一绊，就翻倒在地，闹了个倒栽葱，两条小腿也给擦伤了。这样一来，话便说得越来越火辣辣的主要是冲着黑奴和政府说的，间或也冲木桶骂上几句，就这样东说说，西说说，没个完。