- Baby brain
- Baby bump
- Baby snatcher
- Back seat driver
- Back to square one
- Back to the drawing board
- Bag lady
- Bakers dozen
- Barking up the wrong tree
- Barnet fair
- Basket case
- Bat from the pavilion end
- Be a sport
- Be glad to see the back of
- Beach bum
- Bean counter
- Beat around the bush
- Beauty contest
- Bedroom tax
- Bells and whistles
- Bend over backwards
- Between a rock and a hard place
- Between the wars
- Beyond price
- Biblical
- Big fish in a small pond
- Binge watch
- Bitch slap
- Bite off more than you can chew
- Bite the dust
- Bite your tongue
- Blood blister
- Blood is thicker than water
- Blow a raspberry
- Blue
- Blue plate special
- Boat race
- Body
- Bottle and glass
- Bought the farm
- Brahms and lizst
- Brass monkey weather
- Brass tacks
- Break a leg
- Breast is best
- Bricks and mortar
- Brighton pier
- Bring your a game
- Brown bread
- Brown out
- Brum brum
- Bucket list
- Building
- Burn the midnight oil
- Business
- Bust a move
- Buy a lemon
Idioms beginning with the letter B
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Gary Martin
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