Chopper
来自Big Physics
wiktionary
chop + -er
From the onomatopoeia for the "chop-chop" sound emitted by the main rotor blades of the Bell 47 'OH-13 Sioux' "Angel of Mercy" helicopter, encountered by troops during the Korean War
etymonline
chopper (n.)
1550s, "one who chops," agent noun from chop (v.1). Meaning "meat cleaver" is by 1818. Meaning "helicopter" is from 1951, Korean War military slang (compare egg-beater); as a type of stripped-down motorcycle (originally preferred by Hells Angels) from 1965.
