free falln.

Brit.

/ˌfriː ˈfɔːl/, U.S.

/ˌfri ˈfɔl/,

/ˌfri ˈfɑl/

Origin: Formed within English, by compounding. Etymons: free adj., fall n.²

Etymology: < free adj. + fall n.² Compare Dutch vrij val (1857), German freier Fall (1867 or earlier), Swedish fritt fall (1822 or earlier), also French chute libre (1838 or earlier), and parallels in other European languages. Compare earlier free-falling adj. and the note at that entry.

1. The motion of an object under the influence of gravity alone, there being neither thrust nor appreciable drag acting on it; the state of being in motion under such conditions; frequently in in free fall.Free fall in the strictest sense is experienced by a spacecraft in the absence of thrust from the engines, when any occupants experience weightlessness; this effect can be mimicked by an aeroplane flying in a vertical parabolic path. An object in orbit around a planet or star is in free fall. The term is also applied to the rapid, unrestrained descent of an object under gravity, esp. through the atmosphere, such as that of a ballistic missile in the unpowered phase of its flight, or the part of a parachute descent before the parachute opens.

ΘΚΠ

society > travel > air or space travel > specific movements or positions of aircraft > aerodynamic forces and concepts > [noun] > free fall

free fall1851

free flight1891

the world > movement > motion in a certain direction > downward motion > falling > [adjective] > dropping or falling vertically > under no forces other than gravity

free-falling1842

free fall1851

society > travel > air or space travel > parachuting > [noun] > part of fall before parachute opens

free fall1920

1851 N. Amer. Rev. Jan. 383 Müller treats more at length of the parallelogram of forces, of the lever and balance, of the free fall of bodies,..and the expansion of gases by heat.

1872 R. W. Raymond Statistics Mines & Mining xiii. 393 Which rotary motion being continued during the free fall of the stamp, produces a grinding effect..upon the substance to be crushed.

1919 R. H. Goddard Method of reaching Extreme Altitudes 59 The time of descent [of a rocket] will also be short; but free fall can be satisfactorily prevented by a suitable parachute.

1920 Flight 12 210/1 With parachutes having problematical opening..the uncertainty of the free-fall is such that no one ever dreams of making a practice drop with it at less than 2,000 ft.

1955 Times 25 Aug. 6/3 She claimed a world record for a ‘free fall’ jump, having descended approximately 26,238 ft. before she pulled the ripcord.

1962 F. I. Ordway et al. Basic Astronautics viii. 346 An interplanetary vehicle after its freefall back to Earth will have an approach velocity of 25,000 mph or more.

1994 R. S. Norris et al. Brit., French & Chinese Nucl. Weapons iii. 86 The V-bombers were armed with both U.S. and British free-fall gravity bombs.

2004 Asian Age 15 June (London ed.) 10/4 The ex-President had plummeted for 60 seconds of free fall before his parachute snapped open .

2. figurative. The state or fact of undergoing a rapid or uncontrolled decline (in price, numbers, success, etc.).

ΘΚΠ

the world > movement > motion in a certain direction > downward motion > falling > [noun] > dropping or falling vertically > falling under no forces other than gravity

free fall1971

1971 N.Y. Times 22 Feb. 41/3 Is the bond market's free fall over?

1986 Observer 5 Jan. 18/2 If the price goes into free fall, it could plunge to £4,000 or less.

1990 Elle Aug. 112/3 Her career seemed about to go into free fall.

2004 Chicago Tribune (Midwest ed.) 23 Aug. i. 19/6 Bush has stopped his free fall and is back up to 56 to 58 percent approval ratings.

This entry has been updated (OED Third Edition, June 2008; most recently modified version published online March 2022).

单词	free fall
释义	free falln. Brit. /ˌfriː ˈfɔːl/, U.S. /ˌfri ˈfɔl/, /ˌfri ˈfɑl/ Origin: Formed within English, by compounding. Etymons: free adj., fall n.² Etymology: < free adj. + fall n.² Compare Dutch vrij val (1857), German freier Fall (1867 or earlier), Swedish fritt fall (1822 or earlier), also French chute libre (1838 or earlier), and parallels in other European languages. Compare earlier free-falling adj. and the note at that entry. 1. The motion of an object under the influence of gravity alone, there being neither thrust nor appreciable drag acting on it; the state of being in motion under such conditions; frequently in in free fall.Free fall in the strictest sense is experienced by a spacecraft in the absence of thrust from the engines, when any occupants experience weightlessness; this effect can be mimicked by an aeroplane flying in a vertical parabolic path. An object in orbit around a planet or star is in free fall. The term is also applied to the rapid, unrestrained descent of an object under gravity, esp. through the atmosphere, such as that of a ballistic missile in the unpowered phase of its flight, or the part of a parachute descent before the parachute opens. ΘΚΠ society > travel > air or space travel > specific movements or positions of aircraft > aerodynamic forces and concepts > [noun] > free fall free fall1851 free flight1891 the world > movement > motion in a certain direction > downward motion > falling > [adjective] > dropping or falling vertically > under no forces other than gravity free-falling1842 free fall1851 society > travel > air or space travel > parachuting > [noun] > part of fall before parachute opens free fall1920 1851 N. Amer. Rev. Jan. 383 Müller treats more at length of the parallelogram of forces, of the lever and balance, of the free fall of bodies,..and the expansion of gases by heat. 1872 R. W. Raymond Statistics Mines & Mining xiii. 393 Which rotary motion being continued during the free fall of the stamp, produces a grinding effect..upon the substance to be crushed. 1919 R. H. Goddard Method of reaching Extreme Altitudes 59 The time of descent [of a rocket] will also be short; but free fall can be satisfactorily prevented by a suitable parachute. 1920 Flight 12 210/1 With parachutes having problematical opening..the uncertainty of the free-fall is such that no one ever dreams of making a practice drop with it at less than 2,000 ft. 1955 Times 25 Aug. 6/3 She claimed a world record for a ‘free fall’ jump, having descended approximately 26,238 ft. before she pulled the ripcord. 1962 F. I. Ordway et al. Basic Astronautics viii. 346 An interplanetary vehicle after its freefall back to Earth will have an approach velocity of 25,000 mph or more. 1994 R. S. Norris et al. Brit., French & Chinese Nucl. Weapons iii. 86 The V-bombers were armed with both U.S. and British free-fall gravity bombs. 2004 Asian Age 15 June (London ed.) 10/4 The ex-President had plummeted for 60 seconds of free fall before his parachute snapped open . 2. figurative. The state or fact of undergoing a rapid or uncontrolled decline (in price, numbers, success, etc.). ΘΚΠ the world > movement > motion in a certain direction > downward motion > falling > [noun] > dropping or falling vertically > falling under no forces other than gravity free fall1971 1971 N.Y. Times 22 Feb. 41/3 Is the bond market's free fall over? 1986 Observer 5 Jan. 18/2 If the price goes into free fall, it could plunge to £4,000 or less. 1990 Elle Aug. 112/3 Her career seemed about to go into free fall. 2004 Chicago Tribune (Midwest ed.) 23 Aug. i. 19/6 Bush has stopped his free fall and is back up to 56 to 58 percent approval ratings. This entry has been updated (OED Third Edition, June 2008; most recently modified version published online March 2022). < n.1851
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