The initial idioms of the letter B

be taken to the cleaners (by someone)	be taken under the wing of (someone)
be speaking out of both sides of mouth	be talking through hat
be tall in (one's)/the saddle	be tanked up
be ten a penny	be thankful for small mercies
be that as it may	be the armpit of the world
be the bee's knees	be the best of a bad bunch
be the brains behind	be the business
be the butt of the joke	be the cat's whiskers
be the chief cook and bottle washer	be the day hell freezes over
be the dead spit of	be the death of
be the end of (one)	be the end of one
be the end of the line	be the end of the world
be the exception that proves the rule	be the full quid
be the last person	be the last word in
be the life and soul of the party	be the light of life