Etymology From jar (“to clash, conflict, disturb”) + -ing.
1
That jars (clashes or disagrees); incongruous, conflictful.
The rings of iron that on the doors were hung / Sent out a jarring sound1700, [John] Dryden, “Palamon and Arcite”, in Fables Ancient and Modern; […], London: […] Jacob Tonson, […], →OCLC:
The large cement works nearby are served by sidings, and strike a sudden jarring industrial note in the midst of the rural downland scene.1953 February, H. A. Vallance, “To Brighton through the Shoreham Gap”, in Railway Magazine, page 82:
2 more examples
Slackware does not include a graphical installer. Its package manager does not perform any dependency resolution. This can be jarring for new users, particularly within the last few years, but it also enables a deeper understanding of the system.2018 July 16, Ben Cotton, “The oldest, active Linux distro, Slackware, turns 25”, in Opensource.com:
I could probably take your chick But I just wouldn't 'cause she's jarrin'2019, Stormzy, Vossi Bop:
The jarring of peaches took place at the end of the season.
2
A feeling or movement that jars or jolts.
The striker's job was onerous, too, because there was so little "give" in the metal, and the perpetual jarring was indeed trying to the muscles.1945 January and February, A Former Pupil, “Some Memories of Crewe Works—III”, in Railway Magazine, page 13: