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jar3

[jahr] /dʒɑr/
noun
1.
Archaic. a turn or turning.
Idioms
2.
on the jar, partly opened; ajar:
The window was on the jar.
Origin
1665-1675
1665-75; variant of char3, chare; cf. ajar2
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for on the jar

jar1

/dʒɑː/
noun
1.
a wide-mouthed container that is usually cylindrical, made of glass or earthenware, and without handles
2.
Also jarful. the contents or quantity contained in a jar
3.
(Brit, informal) a glass of alcoholic drink, esp beer: to have a jar with someone
4.
(obsolete) a measure of electrical capacitance
Word Origin
C16: from Old French jarre, from Old Provençal jarra, from Arabic jarrah large earthen vessel

jar2

/dʒɑː/
verb jars, jarring, jarred
1.
to vibrate or cause to vibrate
2.
to make or cause to make a harsh discordant sound
3.
(often foll by on) to have a disturbing or painful effect (on the nerves, mind, etc)
4.
(intransitive) to disagree; clash
noun
5.
a jolt or shock
6.
a harsh discordant sound
Derived Forms
jarring, adjective
jarringly, adverb
Word Origin
C16: probably of imitative origin; compare Old English cearran to creak

jar3

/dʒɑː/
noun
1.
on a jar, on the jar, (of a door) slightly open; ajar
Word Origin
C17 (in the sense: turn): from earlier char, from Old English cierran to turn; see ajar1
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for on the jar

jar

v.

1520s, "to make a harsh, grating sound," usually said to be echoic or imitative, but no one explains how, or of what. Figurative sense of "have an unpleasant effect on" is from 1530s; that of "cause to vibrate or shake" is from 1560s. Related: Jarred; jarring.

n.

"cylindrical vessel," early 15c., possibly from Middle French jarre "liquid measure" (smaller than a barrel), 12c., from Provençal jarra, from Arabic jarrah "earthen water vessel" (whence also Spanish jarra, Italian giarra) [Klein].

Online Etymology Dictionary, © 2010 Douglas Harper
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2
3
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