So much for the ſilk in Judea called Sheſh in Hebrevv, vvhence haply, that fine linen or ſilk is called Shaſhes vvorn at this day about the heads of eaſtern people. 1650, Thomas Fuller, “The Land of Moriah”, in A Pisgah-sight of Palestine and the Confines thereof, with the History of the Old and New Testament Acted thereon, London: […] J. F. for John Williams […], →OCLC, book II, paragraph 24, page 303:
(obsolete, uncountable) Synonym of snow (“random pattern of dots when there is no signal”).
Even productions designed for office or home video viewing usually need a title sequence to mark off the empty tape, hiss and shash from the prepared recording […] 1997, Paul Kriwaczek, Documentary for the Small Screen:
No one sees shash now, but it was naked television. Shash was the term for those black-and-burst patterns that danced across the screen when there was nothing being broadcast. 2012, Paul Farley, Michael Symmons Roberts, Edgelands: Journeys Into England's True Wilderness, page 159:
(intransitive, obsolete, rare) To produce white noise.
The machine shashed and crackled, broadcasting silence. Urgently the man repeated, 'Shearwater, Shearwater, Shearwater. This is Brewmarine. Keith speaking. Over. Over.' More shashing, more silence. 2003, Libby Purves, Casting Off: