The moon shone clear above them, and they rode swiftly abreast, taking that course which the maid must needs have taken if she were to reach her own home.
Arthur Conan Doyle, The Hound of Baskervilles
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Dictionary
Merriam-Webster
— beside one another in line
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Macmillan
— next to each other, facing or moving in the same direction
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Usage
1 use of ‘abreast’ in The Hound of the Baskervilles, by Arthur Conan Doyle