free-fall (n.)youdaoicibaDictYouDict[free-fall 词源字典]
also freefall, 1919, originally of parachutists and in rocketry, from free (adj.) + fall (v.). Related: Free-falling (1962).[free-fall etymology, free-fall origin, 英语词源]
rip (v.)youdaoicibaDictYouDict
"tear apart," c. 1400, probably of North Sea Germanic origin (compare Flemish rippen "strip off roughly," Frisian rippe "to tear, rip") or else from a Scandinavian source (compare Swedish reppa, Danish rippe "to tear, rip"). In either case, from Proto-Germanic *rupjan-, from PIE root *reup-, *reub- "to snatch." Meaning "to slash open" is from 1570s. Related: Ripped; ripping.
In garments we rip along the line at which they were sewed; we tear the texture of the cloth. ... Rend implies great force or violence. [Century Dictionary]
Meaning "to move with slashing force" (1798) is the sense in let her rip, American English colloquial phrase attested from 1853. The noun is attested from 1711. The parachutist's rip cord (1911) originally was a device in ballooning to open a panel and release air.
jumpsuityoudaoicibaDictYouDict
"A garment incorporating trousers and a sleeved top in one piece, worn as a fashion item, protective garment, or uniform", 1940s (originally US): so named because it was first used to denote a parachutist's garment.
pararescueyoudaoicibaDictYouDict
"A rescue carried out by a parachutist or parachutists. Usually attributive designating the person or group carrying out the rescue", 1950s; earliest use found in The New York Times. From para- + rescue.