One may saddle break a horse, or break in a new pair of shoes, but in neither case is the "broken" thing rendered unusable; rather, it's MORE usable. How'd this usage of "break" develop?
Asa, I went to the online OED and found so many definitions of the verb break, from destroying, to breaking in lawn tennis, to breaking bread, to break your heart, to break one's duck (cricket), to better a record (Stock Exchange jargon), to disprove (an alibi), to impair (in health or strength). And that's only a few that I found interesting! I have no idea how all of these have evolved.