Etymology
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sidewalk (n.)

"path for pedestrians on the side of a street," 1721, from side (adj.) + walk (n.). The use of sidewalk for pavement as one of the characteristic differences between American and British English has been noted at least since 1902.

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Definitions of sidewalk

sidewalk (n.)
walk consisting of a paved area for pedestrians; usually beside a street or roadway;
Synonyms: pavement
From wordnet.princeton.edu