envelope

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envelope /ˈɛnvəˌloʊp/ /ˈɑːnvəˌloʊp/ noun
plural envelopes
envelope
/ˈɛnvəˌloʊp/ /ˈɑːnvəˌloʊp/
noun
plural envelopes
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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