In a state of being broached or opened; set in motion or brought under discussion.
From Old French 'abrocher' (to broach), from 'a-' (to) + 'broche' (spit, broach). Originally referred to piercing a barrel to open it; metaphorically extended to opening topics for discussion.
The word originally described literally stabbing a spit through a barrel of wine—imagine how that violent image transformed into meaning 'to bring up a sensitive topic' in conversation.
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