a short news announcement concerning some on-going news story
"The reporter interrupted his interview to deliver a newsflash about the sudden evacuation order for the nearby flood zone."
A brief media report of something that has recently taken place.
"The radio broadcast delivered a newsflash about the sudden earthquake that had just struck the coast."
Introduces an obvious fact of which the person addressed is ostensibly not aware.
"Newsflash, you already missed your flight by twenty minutes."