At the cutting edge and Back-to-back

Back-to-back and at the cutting edge are semantically related. In some cases you can use "Back-to-back" instead an adjective phrase "At the cutting edge".

Back-to-back adjective - Following one after another without others coming in between.

At the cutting edge and back-to-back are semantically related. Sometimes you can use "At the cutting edge" instead an adjective phrase "Back-to-back".