I was just wondering what the origins of "breaking news" or "we broke the story" are.
The word breaking in this context means to
undergo a change or enter a new state, in particular ... of news or a scandal [NOAD]
Etymonline has this interesting tidbit to offer about break:
Meaning "to disclose" is from mid-13c.
That meaning is the flip side of the way you used it, and it is a transitive verb: "He broke the news to me that .." I believe that got modified to "breaking news" by extension.
I worked in the Radio and TV industry as an engineer for over 30 years and have followed the evolution of the term "breaking". This is how I see it.
The term "breaking" refers to a technical procedure used inside a broadcasting studio. Also, it's used by CB radio operators when one keys open the microphone and says, "breaker, breaker or 10-50" to announce their entrance on the channel.
In the early days of radio broadcasting, some affiliate stations could interrupt a closed-circuit network feed by "Breaking In", using an electronic video/audio switching system. During normal operation, a station would be feeding out programs, either produced in-house or pulled in from the network main center. Prior to CNN, three major network centers (ABC, CBS, NBC) managed the network feeds, sending out programming like The Nightly News, Sitcoms and movies. When there's a major disaster, for example, the nearest affiliate feeds their story to their network headquarters who would, then, send it back out for distribution. All the affiliates would have access to the disaster story.
The "ABC Special Report" is an example of a true a break in. The announcer would say, "We interrupt our regularly scheduled program...". They don't have to say, "...breaking news" because it would be redundant. Interrupt means the same.
As TV stations grew in number, so did the competition for viewers. Around the late 70's, a new generation of broadcasters had no knowledge of what Breaking meant and some "bean-counter" thought that it would be a great word for alerting the audience. So, it went from being studio engineer jargon to an on-air declaration, so overused that it has lost its sting.
Now, we can receive a 24-hour feed, directly from FOX, CNN and other production centers. When a FOX News host says, "We now bring you breaking news....", it's all gratuitous because they are already on the network! In the traditional definition, they can't break into themselves!
To break the news to someone most probably is the image of the medieval messenger who bears his message as a roll of parchment, rolled together and sealed. When he comes to the king he breaks the seal and reads the message to the king. He breaks the news to him, actually he breaks the seal and reads the news to him. This two-part expression was shortened, with to break from the first part and news from the second part. Astonishing that etymonline does not mention to break the news to someone.
I believe it derives from the newspaper industry. Before the invention of movable type, a page of news print was printed from a single plate which contained all the text for the page. If, after the plate was cast, an error was found, or a new important story came in, a new plate would have to be created. The old plate, now useless, would be broken up. Hence, breaking news.
This question opens up a very interesting line of enquiry. To answer the question and stimulate your mind at the same time, think of breakers (on the shore). The gracefully-curved waves collapse on the shore, and break into tiny fragments. Now, at one time, fresh information was spoken of as "tidings". Maybe this was because information of far-off events (what we now call news) came with ships, which would use the tides for deeper water on landing. Hence, it seems to me that there is a hidden connection with tides, and the sea in general, with the expression: "breaking news". It arrives fresh on the shore from abroad, as it were, breaking up as it does so. It also seems to me that the word "news" has some connection with tides. In olden days, people might go down daily to the shore, to see what new things (maybe useful items or materials) had been washed up. In the language of those times, these would probably be referred to as "new things", and might be eagerly sought for fuel, construction material etc. After a while, this expression would probably be shortened (as many expressions are) to "news". People might run home with their find, and say: "I have news for you". Well, that's my take on this matter.
On a slightly different note in relation to the question, and after further thought, it occurs to me that there is a clear link between the words: break, breach and broach. (A bottle of wine is broached when first opened, of course, as is a subject of discussion.) Go figure. This does not necessarily contradict the views previously expressed by me (in this same "answer", such as it is).