The initial idioms of the letter B

be thrilled to bits	be thrilled to death
be thrilled to pieces	be through
be thrown in the deep end	be tickled pink death
be tied (up) in knots	be tied to mother's apron strings
be tight-arsed	be tight-lipped
be tipping (it) down	be tired and emotional
be tired to death of (something)	be toast
be toes up	be too clever by half
be too close for comfort	be too good to be true
be too hot to handle	be touch-and-go
touched by, be	be touching cloth
be touching cotton	be trapped in a time warp
be two of a kind	be two sides of the same coin
be under (someone's) wing	be under a cloud
be under a microscope	be under feet