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.

Words nearby flat on one's back

The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.