Sharp-witted and Up on

Sharp-witted adjective - Having or showing a practical cleverness or judgment.

Up on and sharp-witted are semantically related. In some cases you can use "Up on" instead an adjective phrase "Sharp-witted".

Up on adjective - Being up to particular standard or level especially in being up to date in knowledge.

Sharp-witted and up on are semantically related. Sometimes you can use "Sharp-witted" instead an adjective "Up on".