blue wall of silence
idiomStrict secretiveness maintained by the members of a police force with respect to information which might be contrary to their interests, especially information concerning questionable police actions.
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back to the wall
A very difficult situation with no beneficial options available for action.
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balls to the wall
With maximum effort or commitment.
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bang one's head against a brick wall
To waste effort on a futile project.
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blue chamber
A forbidden room.
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blue devils
Low spirits; depression.
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blue moon
A long time.
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blue note
The flatted 5th scale degree in the blues scale.
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blue ribbon
Highly superior in quality, style, substance, prestige, etc.