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Old English side "flanks of a person, the long part or aspect of anything," from Proto-Germanic *sithon (cf. Old Saxon sida, Old Norse siða, Danish side, Swedish sida, Middle Dutch side, Dutch zidje, Old High German sita, German Seite), from adjective *sithas "long" (cf. Old English sid "long, broad, spacious," Old Norse siðr "long, hanging down"), from PIE root *se- "long, late" (see soiree).
Original sense preserved in countryside. Figurative sense of "position or attitude of a person or set of persons in relation to another" (cf. choosing sides) first recorded mid-13c. Meaning "one of the parties in a transaction" is from late 14c.; sense in a sporting contest or game is from 1690s. Meaning "music on one side of a phonograph record" is first attested 1936. Phrase side by side "close together and abreast" is recorded from c.1200. Side-splitting "affecting with compulsive laughter" is attested by 1825.
late 14c., from side (n.).
Extra; additionally: He moonlights as a hackie on the side (1893+)
A form of job action in which employees declare themselves ill and unable to work; blue flu (1970+)