密送

密送	mì sòng	Bcc (for email) / Blind carbon copy (for email)
密	Mì	surname Mi / name of an ancient state
密	mì	dense; close; thick / intimate; close / (bound form) secret; confidential / (Internet slang) to send a private message to (sb); to DM
送	sòng	to send; to deliver; to transmit / to give (as a present) / to see (sb) off / to accompany; to go along with