Between two stools one falls to the ground

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If one is caught between two things, they are unable to properly do or accommodate both.

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The full version is ‘between two stools one falls to the ground’. It is first cited in John Gower’s Confessio Amantis, 1390: “Thou farst [farest] as he betwen tuo stoles That wolde sitte and goth to grounde.”