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Definition of blue box noun from the Oxford Advanced Learner's Dictionary

blue box

noun
 
/ˌbluː ˈbɒks/
 
/ˌbluː ˈbɑːks/
(Canadian English)
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  1. a blue plastic box in which you put rubbish that can be recycled (= processed so that it can be used again) such as paper, cans and bottles
    • If you need a blue box at your house, the city gives them out for free.
See blue box in the Oxford Advanced American Dictionary
hat-trick
noun
 
 
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