| 释义 | send something under plain coverphraseUKformal
 to send something in a plain envelope:
 These are the type of books that are generally sent under plain cover.
 The book was sent to him under plain cover.
 I would like you to check the final proofs, which I am sending under plain cover.
 We are sending, under plain cover, a private invitation to the launch event.
 The information was sent to James by the firm, with a letter under private cover, informing him of the project's progress.
 See also
 
 covernoun(SOMETHING PLACED OVER)
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