Dressed to kill and Up on

Dressed to kill adjective - Dressed in fancy or formal clothing.

Up on and dressed to kill are semantically related. In some cases you can use "Up on" instead an adjective phrase "Dressed to kill".

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

Dressed to kill and up on are semantically related. Sometimes you can use "Dressed to kill" instead an adjective "Up on".