behind back

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behind (one's) back

In one's absence. The phrase typically suggests wrongdoing or deceit. I can't believe you were gossiping about me behind my back! Tom will be upset that we already made the decision behind his back.
See also: back, behind
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

behind someone's back

without someone's knowledge; secret from someone. Please don't talk about me behind my back. She sold the car behind his back, while he was away on vacation.
See also: back, behind
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.

behind (one's) back

In one's absence or without one's knowledge.
See also: back, behind
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.
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References in periodicals archive ?
* From sitting position, have participant clasp hands behind back. Then have him/her lean forward slightly, as far as possible, while lifting hands up as far as possible.
Husband Philip, hands behind back, must have been in knots watching his wife implode.
In their most recent meeting in 2014 the friendly fixture finished 1-1 but that came on the one behind back anyone LISA back of some significant victories for the Scots, including an 8-1 trouncing in Portugal in 2003.
The first is Udontdodou, who failed to do himself justice at Catterick last week and can leave that form miles behind back at a more suitable track.
MalacaAaAaAeA~ang spokesman Edwin Lacierda is right when he said (finge crossed behind back) that the President can give orders all the way down to any government official.
The basic Rupert figure shown here, model number 2694 (arms behind back) was frequently traded for around pounds 250 but today an auction price would be around pounds 50-pounds 80.
There was nowhere to move to but his attitude was to physically push the people behind back - not sensible.
On toes or knees, and with hands behind the head or behind back, slowly roll down the ball.
The managers who get behind Back to the Shop Floor are supporting the vital work of Marie Curie nurses.
The managers who get behind Back To The Shop Floor will be supporting this work.
Philip Hobbs's charge is the 5-2 second favourite with Ladbrokes after finishing a respectable fourth behind Back In Front in the Bula Hurdle last time.
I promise this will be my last recollection of the Carling Cup Final (fingers crossed behind back.) I saw opportunism at its best.
Taaffe's charge lined up at last year's Cheltenham Festival and ran a fine race to be second in the Supreme Novices' Hurdle behind Back In Front.
Drop left hand behind back and rest it on lower back or right hip.