No radio amateur in his or her right mind would be caught dead saying “Breaker Breaker” on the airwaves these days.
But we do have occasion to say “break,” for example when others are passing “traffic” or information, and we have a bona fide need to interrupt.
Ever wonder where the term came from? Wonder no more! :-)
As is often the case with ham radio jargon, the term “break” harkens back to the pre-radio telegraph operator days. Telegraphs transmitted their signals by wire, so the various telegraph stations in an area were all inter-connected by this wire. When one telegraph operator was sending, everyone else on the line . . .
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