One of the mysteries of the English language finally explained.
1A pocket in the side portion or side seam of a garment, especially a coat or jacket.
2A pocket or pouch used to store items at the side of a vehicle, tent, bag, etc.
Late 17th century; earliest use found in Edward Ravenscroft (fl. 1659–1697), playwright. From side + pocket.
side pocket/ˈsʌɪd ˌpɒkɪt/
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