flat on one's back

flat on (one's) back

Lacking the strength or ability to get up. Often used when someone is sick or injured, but it can be used figuratively as well. Oh man, I'm flat on my back with this flu. I haven't been out of bed in days! Sally's been flat on her back ever since she broke her leg. She's having a really hard time getting around in her cast. Losing my job has left me flat on my back. I'm really worried about how I'll pay my bills right now.
See also: back, flat, on
Farlex Dictionary of Idioms.

flat on one's back

1. Sick in bed. For example, The flu has put her flat on her back.
2. Helpless, without recourse, defeated, as in I wish I could help but the recession has put me flat on my back.
See also: back, flat, on
The American Heritage® Dictionary of Idioms by Christine Ammer.
See also:
  • flat on (one's) back
  • flat on back
  • be (flat) on (one's) back
  • come in
  • come in a certain position
  • come on in
  • damn well
  • (Is) that everything?
  • a cold day in Hell
  • (Is) this taken?