“jar” – English explanatory dictionary

noun a container for food such as jam, usually made of glass ○ There was some honey left in the bottom of the jar. ○ Open another jar of jam – this one is empty. ■ verb to produce an unpleasant effect ○ He tripped over the step, jarring his knee. ○ The drilling sound jarred on my ears. ○ Orange curtains will jar with purple cushions.

(jär), n. [See Ajar.] A turn. [Only in phrase.] On the jar, on the turn, ajar, as a door.

(jär), n. [F. jarre, Sp. jarra, from Ar. jarrah ewer; cf. Pers. jarrah.]
1. A deep, broad-mouthed vessel of earthenware or glass, for holding fruit, preserves, etc., or for ornamental purposes; as a jar of honey; a rose jar. Dryden.
2. The measure of what is contained in a jar; as a jar of oil; a jar of preserves. Bell jar, Leyden jar. See in the Vocabulary.

v. i. [imp. & p. p. Jarred p. pr. & vb. n. Jarring ] [Cf. OE. charken to creak, AS. cearcian to gnash, F. jars a gander, L. garrire to chatter, prate, OHG. kerran to chatter, croak, G. quarren to grumble, and E. jargon, ajar.]
1. To give forth a rudely quivering or tremulous sound; to sound harshly or discordantly; as the notes jarred on my ears. “When such strings jar, what hope of harmony ?” Shak. “A string may jar in the best master’s hand.” Roscommon.
2. To act in opposition or disagreement; to clash; to interfere; to quarrel; to dispute. “When those renowned noble peers Greece
Through stubborn pride among themselves did jar.” Spenser. “For orders and degrees
Jar not with liberty, but well consist.” Milton.

v. t. 1. To cause a short, tremulous motion of, to cause to tremble, as by a sudden shock or blow; to shake; to shock; as to jar the earth; to jar one’s faith.
2. To tick; to beat; to mark or tell off. [Obs.] “My thoughts are minutes, and with sighs they jar
Their watches on unto mine eyes.” Shak.