back to the wall

back to the wall idiom
Also, back against the wall. In a hard-pressed situation; also, without any way of escape. For example, In the closing few minutes, our team had its back to the wall but continued to fight gallantly, or The bank has him with his back to the wall; he'll have to pay up now. This term was used originally for a military force that is making a last stand. [First half of 1500s]

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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