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in confidence

In private; with the understanding that what was said will not be revealed. Sometimes used with the modifiers "strict" or "the strictest." I can't believe you told your husband about my operation—I told that to you in confidence! Gentlemen, please be aware that this meeting is being held in the strictest confidence.
See also: confidence

in the strict(est) sense

Following the narrowest and most precise interpretation (of something). While not correct in the strictest sense, the word has been widely accepted among most English speakers. I wouldn't call her a socialist in the strict sense, but some of her beliefs definitely lean that way.
See also: sense
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

in confidence

Also, in strict confidence. Privately, on condition that what is said will not be revealed. For example, The doctor told her in confidence that her mother was terminally ill, or He told us in strict confidence that Gail was pregnant. This idiom was first recorded in 1632. Also see take into one's confidence.
See also: confidence
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.
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References in periodicals archive ?
The strict rest group spent an average 3.8 hours in school or after-school activities, compared to 6.7 hours among the usual-care group (P < .05).
RACE II randomized 614 patients with permanent atrial fibrillation at 33 Dutch medical centers to strict or lenient rate control to be achieved with beta-blockers, calcium channel blockers, and/or digoxin.
RACE II randomized 614 patients with permanent atrial fibrillation at 33 Dutch medical centers to strict or lenient rate control via beta-blockers, calcium channel blockers, and/or digoxin.
He is careful not to come down harshly on any side and acknowledges that strict construction became the most widely accepted position.
Agbonlahor looks back now believing that his strict father helped him turn the corner.
Berco Production is owned by the Swedish financial consulting services and investment company STRICT AB.
Gallup has asked Americans 20 times over the last 16 years whether laws covering the sale of firearms should be made more strict, made less strict, or kept as they are now.
In addition, there are strict EPA and ADA guidelines to which we must adhere.
My dad is so strict. I know he loves me, but he doesn't really show it.
Islamic militias are stepping up their efforts to bring strict religious law to war-ravaged Somalia.
If there is one phrase that every student of constitutional law learns, it is that fundamental rights trigger strict scrutiny.
In recent years, the strict emphasis on cost, combined with strict end-strength limitations, has led to a reduction of in-house technical expertise and, some believe, if maintained over the longer term, will lead to the possible elimination of NWCF entities.