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envelope

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envelope/ˈɛnvəˌloʊp, ˈɑːnvəˌloʊp/noun
pluralenvelopes
envelope
/ˈɛnvəˌloʊp, ˈɑːnvəˌloʊp/
noun
pluralenvelopes
Learner's definition of ENVELOPE  
[count]
: an enclosing cover for a letter, card, etc.
— see picture at mail

push the envelope

: to go beyond the usual or normal limits by doing something new, dangerous, etc.
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