be (flat) on (one's) back(redirected from be on his back)
Like this video? Subscribe to our free daily email and get a new idiom video every day!
be (flat) on (one's) back
To have no 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 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.