look like death warmed over
US /lʊk laɪk dɛθ wɔrmd ˈoʊvər/
UK /lʊk laɪk dɛθ wɔrmd ˈoʊvər/

1.
to look very ill or tired
:
•
After working all night, he really did look like death warmed over.
•
She's been sick for a week and now she looks like death warmed over.