- Baby blues
- Baby boomer
- Baby father
- Back of beyond
- Back-seat driver
- Back the field
- Back to basics
- Back to square one
- Back to the drawing board
- Backroom boy
- Backward in coming forward
- Bacon
- Bad books
- Bad egg
- Bad hair day
- Bad money drives out good
- Bada-bing
- Badger to death
- Bad news travels fast
- Bag and baggage
- Baker's dozen
- Balance of power
- Balance of trade
- Bald as a coot
- Bale out/bail out
- Ball and chain
- Balling the jack
- Ballpark figure
- Bandy words
- Bane of your life
- Bang on about
- Baptism of fire
- Barge-pole
- Barking mad
- Barking dogs never bite
- Barking up the wrong tree
- Barrel of laughs
- Basket case
- Bated breath
- Bats in the belfry
- Batten down the hatches
- Battle royal
- Be afraid, be very afraid
- Be enthralled
- Be still, my beating heart
- Beam ends
- Bean counter
- Beast with two backs
- Beat a hasty retreat
- Beat around the bush
- Beat swords into ploughshares
- beat the band
- Beat the living daylights out of someone
- Beating a dead horse
- 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
- Beer goggles
- Bee-line
- Bee's knees
- Beetle-browed
- Before the fact
- Before you can say Jack Robinson
- Beg the question
- Beggar belief
- Beggars can't be choosers
- Behind every great man there's a great woman
- Behind the eight ball
- Bell, book and candle
- Bell the cat
- Belle of the ball
- Below par
- Below the belt
- Below the salt
- Bells and whistles
- Belt and braces
- Belt up
- Best bib and tucker
- Best defense is a good offence
- Best laid schemes of mice and men
- Bet your bottom dollar
- Better half
- Better late than never
- 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
- Beware the Ides of March
- Beyond a shadow of a doubt
- Beyond belief
- Beyond our ken
- Beyond the pale
- Biblical phrases
- Big Apple
- Big cheese
- Big Easy
- Big fish in a small pond
- Big fleas have little fleas upon their back to bite 'em
- Big wig
- bigger bang for your buck
- Bill Stickers is innocent
- Billy-o
- Billy no mates
- Binge drinking
- Bird in the hand is worth two in the bush
- Birds and the bees
- Birds of a feather flock together
- Bish-bash-bosh
- Bish-bosh
- Bite the bullet
- Bite the dust
- Bitter end
- Black as Newgate's knocker
- Black-on-black
- Black sheep of the family
- Blast from the past
- Blaze a trail
- Bless you!
- Blind-man's buff
- Blind leading the blind
- Bling-bling
- Blonde bombshell
- Blood and thunder
- Blood is thicker than water
- Blood toil tears and sweat
- Blood, sweat and tears
- Bloody-minded
- Blot on the landscape
- raspberry tart
- Blow the gaff
- Blow your mind
- Blow your own trumpet
- Blown to smithereens
- Blue blood
- Blue funk
- Blue moon
- Blue-plate special
- Bob's your uncle
- Bode well
- Bodice ripper
- Body – phrases related to the human body
- Body surfing
- Bog standard
- Bold as brass
- Bolt from the blue
- Bone dry
- Bone idle
- Bone up on
- Booby prize
- Booby trap
- Boogie-woogie
- boots
- 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
- Boxing Day
- Boys will be boys
- Brand spanking new
- Brass monkey weather
- Brass tacks
- Bread always falls buttered side down
- Bread of life
- Break a leg
- Break the ice
- Bricks and clicks
- Bring home the bacon
- Broad in the beam
- Broke
- Bronx cheer
- Brook no truck with
- Brown as a berry
- Browned off
- Brownie points
- Brummagem screwdriver
- Brush
- Bubble and squeak
- Buck stops here
- Buckle down
- Bucket list
- Bugger Bognor!
- Buggins' turn
- Build a better mousetrap and the world will beat a path to your door
- Bullet
- Bums on seats
- Bun in the oven
- Bunch of fives
- 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
- Butt end of the stick
- Busy as a one-armed paperhanger
- Butter no parsnips
- Butter side down
- Butter wouldn't melt in his mouth
- Butterfingers
- 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
- By your leave
- Bygones be bygones
Sayings that start with the letter B
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Gary Martin
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