flat on one's back

idiom

Definition of flat on one's back

: lying with one's back against the ground, on a bed, etc. The accident left him (lying) flat on his back (in bed) for two weeks. This phrase is sometimes used figuratively.The stock market has been flat on its back.

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“Flat on one's back.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/flat%20on%20one%27s%20back. Accessed 23 Sep. 2020.

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