noun
: any of the intermediate swiveling or pivoted bearings for a square shaft (as in a gantry) that can be knocked aside (as by a traveling crab moving along the shaft and gearing with it)
noun
: any of the intermediate swiveling or pivoted bearings for a square shaft (as in a gantry) that can be knocked aside (as by a traveling crab moving along the shaft and gearing with it)
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012