s something wrong or bad about it.Bag of bonesIf someone is a bag of bones, they are very underweight.Bag of nervesIf someone is a bag of nerves, they are very worried or nervous.Bare your heartIf you bare your heart to someone, you tell them your personal and private feelings. ('Bare your soul' is an alternative form of the idiom.)Bat an eyelidIf someone does not bat an eyelid, they do not react or