looks like death warmed over

Looks like death warmed over is an expression a person might use when they want to say that someone looks very ill or is appearing to be sick in some way. When you look like death warmed over, you typically have a look about you to insist you are ill, possibly severely ill and nearly fatal, though this is usually just an exaggerated way to say the severity of how ill someone looks which usually includes pale skin, sweating or looking ill in another way.