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Away from others; in private. We need to meet in secret so that the paparazzi don't see us together. You better speak to him in secret about that, instead of ambushing him in front of the whole staff.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
secretly. They planned in secret to blow up the bridge. I will tell her in secret so no one else will hear.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
Unknown to others, privately. For example, They met in secret, or, as Shakespeare put it in Love's Labour's Lost (5:2): "One word in secret." [Second half of 1400s]
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Without others knowing.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.