A lot vs. Alot: 9 Grammatical Pitfalls
"path for pedestrians on the side of a street," 1739, 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 since at least 1902.
A critical observation, esp an oblique one: took a sideswipe at ''restrictive court decisions''
[1924+; fr sideswipe, ''a glancing blow,'' found by 1917]