Baby blues
Baby boomer
Baby father
Back of beyond - The
Back-seat driver
Back the field
Back to basics
Back to square one
Back to the drawing board
Backroom boy
Bad books
Bad egg
Bad hair day
Badgered to death
Bag and baggage
Baker's dozen
Balance of power - The
Balance of trade - The
Bald as a coot
Bale out/bail out
Ball and chain
Bandy words with
Bane of your life
Bang on about
Baptism of fire
Barge-pole - Wouldn't touch with a
Barking mad
Barking up the wrong tree
Basket case
Bated breath
Bats in the belfry
Batten down the hatches
Battle royal
Be afraid, be very afraid
Be still, my beating heart
Beam ends - On your
Beast with two backs
Beat about the bush
Beat swords into ploughshares
Beat a hasty retreat
Beat the living daylights out of someone
Beauty is in the eye of the beholder
Beauty is only skin deep
Beck and call
Bed of roses
Bee in your bonnet
Beef and reef
Beelzebub has a devil for a sideboard
Been there, done that
Beer and skittles
Bee-line - make a bee-line for
Bee's knees - The
Beetle-browed
Before you can say Jack Robinson
Beg the question
Behind every great man there's a great woman
Behind the eight ball
Bell, book and candle
Belle of the ball
Below the belt
Below the salt
Belt and braces
Belt up
Best bib and tucker
Best laid schemes of mice and men - The
Bet your bottom dollar
Better half
Better to have loved and lost than never to have loved at all
Between a rock and a hard place
Between the Devil and the deep blue sea
Between two stools
Between you, me and the bed-post
Beware of Greeks bearing gifts
Beyond our ken
Beyond the pale
Biblical phrases
Big Apple - The
Big cheese - The
Big Easy - The
Big fish in a small pond
Big wig
Bill Stickers is innocent
Billy-o - Like
Billy no mates
Binge drinking
Bird in the hand is worth two in the bush - A
Birds and the bees - The
Birds of a feather flock together
Bite the bullet
Bite the dust
Bitter end - The
Black as Newgate's knocker
Black-on-black
Black sheep of the family
Blast from the past
Blaze a trail
Blind leading the blind - The
Bling-bling
Blonde bombshell
Blood and thunder
Blood is thicker than water
Bloody-minded
Blot on the landscape
Blow a raspberry - see raspberry tart
Blow your mind
Blow your own trumpet
Blown to smithereens
Blue blood
Blue-plate special
Bob's your uncle
Bode well
Bodice ripper
Body surfing
Bog standard
Bolt from the blue
Bone dry
Bone idle
Bone up on
Booby prize
Booby trap
Boogie-woogie
Booze cruise
Born again
Born with a silver spoon in one's mouth
Born within the sound of Bow Bells
Boss eyed
Bottle out
Bottom drawer
Bottom-up
Bought the farm
Bowled a maiden over
Box and Cox
Box-seat - in the
Boxing Day
Brand spanking new
Brass tacks - get down to
Bread always falls buttered side down
Bread of life - The
Break a leg
Break the ice
Bricks and clicks
Broad in the beam
Brown as a berry
Brownie points
Brummagem screwdriver
Bubble and squeak
Buck stops here - The
Buckle down
Bums on seats
Bun in the oven
Bunch of fives - A
Bunny boiler
Burn the candle at both ends
Burning the midnight oil
Bury the hatchet
Bury your head in the sand
Busy as a bee
Butter wouldn't melt in his mouth
By and large
By dint of
By gum
By hook or by crook
By the board
By the book
By the short hairs
By the skin of your teeth