B
Blind the sack before it be full.
适可而止
Better late than never.
亡羊补牢---犹未迟
Better to do well than to say.
口说不如实干
Beat the dog before the lion.
杀鸡骇猴
Barking dogs seldom bite.
吠犬不咬人
By fits and starts.
一阵阵
By leaps and bounds.
突飞猛进
Burn your boats.
破釜沉舟
Braving the wind and dew.
风餐露宿
Be stark naked.(Be in birthday suit.)
一丝不挂
Burn the midnight oil.
开夜车
Body guard.
保镖
Blind alley.
死胡同
Break up.
离散,吹了（欢迎补充）
Blow hot and cold.
朝三暮四
Blood is thicker than water.
血溶于水
Barking dogs do not bite.
吠犬不咬人
Be overrun.
横行霸道，无恶不作
Be completely honest .
坦坦荡荡
Be as ragged and wild.
破破烂烂
Birds of a feather flock together.
物以类聚，人以群分。
