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Boil down to to be the main reason for something or the most basic part of something(ÇÙ½É[º»Áú]ÀÌ ¡¦ÀÌ´Ù): In the end, what it all boils down to is money, or the lack of it.
Bold as brass very confident and not worried about how other people will respond(¾ó±¼¿¡ öÆÇÀ» ±ñ; ½ÉÀåÀÌ °Ã¶ °°Àº): He doesn't know any shame and is bold as brass.
Bolt from the blue something happens unexpectedly and suddenly(¸¼Àº Çϴÿ¡ ³¯º¶ô, ûõº®·Â): Her dismissal came as a bolt from the blue.
Bone of contention an issue that always causes tension and arguments(´ÙÅù°Å¸®, ´ÙÅùÀÇ ¿øÀÎ): We've fought for so long that we've forgotten what the bone of contention is.
Bone to pick you are annoyed about something they have done and want to tell them how you feel((~¿¡°Ô µûÁú ÀÏÀÌ ÀÖ´Ù): I had a bone to pick with her, but she was so sweet that I forgor about it.