Definition of broaches:
(v) :
(transitive, figuratively) To begin discussion about (something).
(v) :
(transitive) To make a hole in, especially a cask of liquor, and put in a tap in order to draw the liquid.
(v) :
(transitive) To open, to make an opening into; to pierce.
(v) :
(intransitive)To be turned sideways to oncoming waves, especially large or breaking waves.
(v) :
(transitive) To cause to turn sideways to oncoming waves, especially large or breaking waves (usually followed by to; also figurative).
(v) :
(nautical, intransitive, of a submerged submarine, torpedo, or similar) To break the surface of the water.