| black rider |
| black sheep |
| blame Canada |
| blame game |
| blanket term |
| blank out |
| blare out |
| blast from the past |
| blast off |
| blast out |
| blaze a trail |
| blaze away |
| bleeding edge |
| bleeding-edge |
| bleed red ink |
| blend into the woodwork |
| blessed event |
| bless someone with |
| bless you |
| blimp out |
| blind date |
| blind leading the blind |
| blind with science |
| blink-and-you-miss-it |
| blink first |
| blink of an eye |
| blocking and tackling |
| block out |
| Blondin |
| blood and guts |
| bloodclaat |
| blood in the water |
| blood is thicker than water |
| blood, sweat and tears |
| bloom is off the rose |
| blossom out |
| blot one's copy book |
| blot on the escutcheon |
| blow |
| blow a fuse |
| blow a hole through |
| blow a kiss |
| blow away |
| blow chunks |
| blow hot air |
| blow hot and cold |
| blow me |
| blow me down |
| blow off |
| blow off steam |
| blow one's chance |
| blow one's load |
| blow one's own trumpet |
| blow one's wad |
| blow out of proportion |
| blow out of proportions |
| blow out of the water |
| blow over |
| blow someone's back out |
| blow someone's brains out |
| blow someone's cover |
| blow someone's mind |
| blow the cobwebs away |
| blow the doors off |
| blow the lid off |
| blow the whistle |
| blow this Popsicle stand |
| blow this pop stand |
| blow to kingdom come |
| blow tomahawks |
| blow town |
| blow up in one's face |
| blue-ball |
| bluebird of happiness |
| blue chamber |
| blue devils |
| blue-eyed |
| blue-eyed boy |
| blue moon |
| blue note |
| blue ribbon |
| blue-sky thinking |
| blue state |
| blue wall of silence |
| blur the line |
| blurt out |
| Bob's your uncle |
| body blow |
| body English |
| bogged down |
| bog off |
| boiling frog |
| boiling hot |
| boiling mad |
| boiling point |
| boil over |
| boil up |
| boldly go where no man has gone before |
| bolt bucket |
| bolt from the blue |
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