be skin and bone

be (all) skin and bone(s)

To be extremely thin. I know the merger has been stressful, but have you been eating? Because you're skin and bone these days. I was all skin and bones after I returned from my service trip, so my mom insisted on making me home-cooked meals for a month.
See also: and, skin
Farlex Dictionary of Idioms.

be skin and bone

be very thin.
See also: and, bone, skin
Farlex Partner Idioms Dictionary

be (all/just/nothing but) skin and ˈbone(s)

(informal) be very or too thin: After two years in prison, he was nothing but skin and bone.
See also: and, bone, skin
Farlex Partner Idioms Dictionary
See also:
  • be (all) skin and bone(s)
  • (all) skin and bones
  • get under someone's skin, to
  • under (one's)/the skin
  • under the skin
  • Skin me!
  • skin back
  • skin up
  • rattlebones
  • rattle-bones