Answer: broaching

AnswerCrossword Clue
broachingBROACH, to pierce (to thrust, or make a hole through)
broachingPierce (a cask) to draw liquor
broachingOpen and start using the contents of (a bottle or other container)
broaching(of a fish or sea mammal) Rise through the water and break the surface
broachingRaise (a sensitive or difficult subject) for discussion