Definitions for jackknife
ˈdʒækˌnaɪfjack·knife

Princeton's WordNetRate this definition:5.0 / 1 vote

1. clasp knife, jackknifenoun

   a large knife with one or more folding blades

2. jackknifeverb

   a dive in which the diver bends to touch the ankles before straightening out

3. jackknifeverb

   dive into the water bending the body at the waist at a right angle, like a jackknife

WiktionaryRate this definition:0.0 / 0 votes

1. jackknifenoun

   A resampling method that applies estimators to all subsamples that each omit a single different group (possibly of a single datapoint) of the original sample to provide a sample distribution of the estimate.

ChatGPTRate this definition:0.0 / 0 votes

1. jackknife

   The jackknife (also known as the Quenouille jackknife) is a statistical method used for estimating a parameter from a sample of observations by systematically leaving out one observation at a time and recalculating the estimate. The aim of this method is to reduce bias and provide more accurate confidence intervals. This resampling method is used in fields like econometrics, computational statistics, and machine learning. Also, a jackknife is a compact folding knife that typically contains multiple blades or tools. It's commonly used for tasks like cutting ropes, opening packages or peeling fruits. It was originally designed as a portable utility knife for sailors. The term 'jackknife' can also refer to a specific position or maneuver in activities like diving, truck driving, yoga or gymnastic where the body is bent at the waist in a V-shape.

Webster DictionaryRate this definition:5.0 / 1 vote

1. Jackknifenoun

   a large, strong clasp knife for the pocket; a pocket knife

Suggested ResourcesRate this definition:0.0 / 0 votes

1. jackknife

   Song lyrics by jackknife -- Explore a large variety of song lyrics performed by jackknife on the Lyrics.com website.

Matched Categories

1. • Dive
   • Pocketknife
   • Sport

Usage in printed sourcesFrom: 

1. [["1764","1"],["1809","1"],["1824","2"],["1825","1"],["1826","1"],["1830","3"],["1831","2"],["1833","5"],["1836","8"],["1837","6"],["1838","4"],["1839","5"],["1840","2"],["1841","1"],["1843","2"],["1845","6"],["1846","6"],["1847","15"],["1848","7"],["1849","6"],["1850","15"],["1851","11"],["1852","17"],["1853","13"],["1854","12"],["1855","27"],["1856","40"],["1857","29"],["1858","11"],["1859","18"],["1860","31"],["1861","4"],["1863","15"],["1864","31"],["1865","32"],["1866","25"],["1867","29"],["1868","15"],["1869","14"],["1870","21"],["1871","26"],["1872","30"],["1873","22"],["1874","28"],["1875","27"],["1876","35"],["1877","23"],["1878","17"],["1879","31"],["1880","17"],["1881","25"],["1882","40"],["1883","51"],["1884","19"],["1885","30"],["1886","23"],["1887","65"],["1888","45"],["1889","34"],["1890","47"],["1891","112"],["1892","116"],["1893","68"],["1894","69"],["1895","59"],["1896","45"],["1897","75"],["1898","122"],["1899","131"],["1900","80"],["1901","91"],["1902","99"],["1903","80"],["1904","72"],["1905","77"],["1906","97"],["1907","88"],["1908","120"],["1909","87"],["1910","152"],["1911","138"],["1912","138"],["1913","149"],["1914","113"],["1915","154"],["1916","128"],["1917","151"],["1918","150"],["1919","113"],["1920","79"],["1921","125"],["1922","159"],["1923","141"],["1924","114"],["1925","115"],["1926","90"],["1927","151"],["1928","105"],["1929","106"],["1930","126"],["1931","124"],["1932","136"],["1933","81"],["1934","98"],["1935","143"],["1936","183"],["1937","218"],["1938","205"],["1939","257"],["1940","243"],["1941","218"],["1942","251"],["1943","237"],["1944","153"],["1945","186"],["1946","153"],["1947","282"],["1948","261"],["1949","325"],["1950","324"],["1951","264"],["1952","256"],["1953","231"],["1954","303"],["1955","305"],["1956","229"],["1957","240"],["1958","223"],["1959","229"],["1960","267"],["1961","264"],["1962","389"],["1963","375"],["1964","284"],["1965","293"],["1966","345"],["1967","347"],["1968","410"],["1969","356"],["1970","311"],["1971","464"],["1972","493"],["1973","623"],["1974","520"],["1975","372"],["1976","451"],["1977","729"],["1978","614"],["1979","591"],["1980","630"],["1981","611"],["1982","672"],["1983","803"],["1984","753"],["1985","965"],["1986","956"],["1987","881"],["1988","1059"],["1989","1263"],["1990","976"],["1991","1081"],["1992","1238"],["1993","1888"],["1994","1408"],["1995","1260"],["1996","1412"],["1997","1585"],["1998","1503"],["1999","1751"],["2000","1783"],["2001","1892"],["2002","2393"],["2003","2178"],["2004","2303"],["2005","2526"],["2006","2157"],["2007","2492"],["2008","3033"]]

How to pronounce jackknife?

1. Alex

   US English

   David

   US English

   Mark

   US English

   Daniel

   British

   Libby

   British

   Mia

   British

   Karen

   Australian

   Hayley

   Australian

   Natasha

   Australian

   Veena

   Indian

   Priya

   Indian

   Neerja

   Indian

   Zira

   US English

   Oliver

   British

   Wendy

   British

   Fred

   US English

   Tessa

   South African

How to say jackknife in sign language?

Numerology

1. Chaldean Numerology

   The numerical value of jackknife in Chaldean Numerology is: 1

2. Pythagorean Numerology

   The numerical value of jackknife in Pythagorean Numerology is: 7

Examples of jackknife in a Sentence

1. Chris Christie:

   He's going to a gunfight with a sword, he doesn't even have a sword. He has a jackknife.

Popularity rank by frequency of use

References

1. ^ Princeton's WordNet
   http://wordnetweb.princeton.edu/perl/webwn?s=jackknife
2. ^ Wiktionary
   https://en.wiktionary.org/wiki/Jackknife
3. ^ ChatGPT
   https://chat.openai.com
4. ^ Webster Dictionary
   https://www.merriam-webster.com/dictionary/jackknife
5. ^ Usage in printed sources
   https://books.google.com/ngrams/graph?content=jackknife