Important Idioms and Phrases starting with Alphabet- B
| S.No. | Idioms/Phrases | Meaning |
| 1. | Back stairs gossip | Talk among servants/ unfair talks |
| 2. | Bad blood | Enmity/ bitter relations |
| 3. | Bag and baggage | With all belongings |
| 4. | Baker’s dozen | Thirteen in number |
| 5. | Be born with a silver spoon in one’s mouth | To be born in a rich family |
| 6. | Be in the driving seat | Bearing all responsibilities |
| 7. | Bear the brunt of | To bear the main part of something unpleasant |
| 8. | Beat about the bush | To talk in a roundabout manner/ circumlocution |
| 9. | Beat black and blue | Beating mercilessly |
| 10. | Beat hollow | To defeat thoroughly and convincingly |
| 11. | Beck and call | Ready to obey order instantly |
| 12. | Bed of roses | Pleasant situation of comfort |
| 13. | Bed of thorns | A situation of extreme difficulty |
| 14. | Beggar description | A person with no resource |
| 15. | Bell the cat | Taking first step at personal risk |
| 16. | Between the devil and the deep sea | Between two difficult situations |
| 17. | Big gun | An influential person |
| 18. | Bird of passage | One who comes occasionally |
| 19. | Bird’s eye view | Overview |
| 20. | Birds of feather | People with the same idea, characteristics and interests
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| 21. | Bite the dust | To be defeated |
| 22. | Black sheep | A person who is regarded as disgrace for his family/ team etc. |
| 23. | Blind alley | A situation in which no further progress can be made |
| 24. | Blind date | A meeting between a girl and a boy, who have not met before |
| 25. | Blow one’s own trumpet | To praise oneself |
| 26. | Blue blood | Royal or aristocratic descent |
| 27. | Blue book | Government report |
| 28. | Body and soul | Entirely |
| 29. | Bolt from the blue | Unexpected problem |
| 30. | Bone of contention | Subject of a dispute |
| 31. | Boon/blessing in disguise | Hidden blessing |
| 32. | Bosom friend | Fast friend |
| 33. | Break the ice | To start a conversation |
| 34. | Breathe one’s last | To pass away/ to die |
| 35. | Broad day light | In day light (when crime cannot be hidden) |
| 36. | Broken reed | A weak, unreliable person |
| 37. | Brown study | A state of deep thought |
| 38. | Bull in the china shop | One who is out of place in a delicate situation |
| 39. | Burn a hole in the pocket | Money spent quickly |
| 40. | Burn one’s fingers | To get oneself into trouble |
| 41. | Burn the candle at both ends | To waste money |
| 42. | Burn the midnight oil | Labouring/studying till late night |
| 43. | Burning question | Hot issue |
| 44. | Bury the hatchet | To end a hostility |
| 45. | By fits and starts | Irregularly |
| 46. | By hook or by crook | By any means, right or wrong |
| 47. | By leaps and bounds | At a rapid pace |
| 48. | By the skin of one’s teeth/ by a whisker | Narrowly/by a hair breadth |