back against the wall
see back to the wall.
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
Examples from the Web for back against the wall
There were no back-against-the-wall poses in Dicky's theory of wooing.Cabbages and Kings|O. Henry