2、c. 1300, from Old French baril (12c.)"barrel, cask, vat,"with cognates in all Romance languages (such as Italian barile, Spanish barril), but origin uncertain; perhaps from Gaulish, perhaps somehow related to bar (n.1). Meaning"metal tube of a gun"is from 1640s. Barrel roll in aeronautics is from 1927.
4、mid-15c.,"to put in barrels,"from barrel (n.). Meaning"to move quickly"is 1930, American English slang, perhaps suggestive of a rolling barrel. Related: Barreled; barreling.