The initial idioms of the letter B

beat (something) to death	beat a dead horse
beat a retreat	beat a path to door
beat a path to someone's door	beat about the bush
beat against	beat (someone or something) all hollow
beat around the bush	beat at
beat back	beat Banagher
beat box	beat brains
beat brains out	beat breast
beat down on	beat down to size
beat feet	beat gums
beat (one's) head against a stone wall	beat head against the wall
beat (someone) to the draw	beat (someone) at his or her own game
beat hollow	beat into
beat it	Beat it!
beat (someone's) brains in	beat (one's) meat