raise (a difficult subject) for discussion

he broached the subject he had been avoiding all evening

pierce (a cask) to draw out liquid

he watched a pot boy broach a new cask

(of a fish or sea mammal) rise through the water and break the surface

the salmon broach, then fall to slap the water

(of a ship) veer and pitch forward, presenting a side to the wind and waves and losing steerage control

we had broached badly, side on to the wind and sea