let it slip

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let (something) slip

To accidentally or inadvertently reveal some secret or important piece of information. I can't believe your sister let news of our engagement slip in front of your parents! The agent, under the influence of a powerful truth serum, let slip the names of other operatives working covertly in the area.
See also: let, slip

let it slip

To accidentally or inadvertently reveal a given secret or important piece of information. We had done so well keeping our engagement a secret. I can't believe I let it slip in the middle of dinner last night!
See also: let, slip
References in periodicals archive ?
VALENCIA - It was a hot day in the desert, and local scientist Skip Newhall isn't about to let it slip away.
Always let it slip that your program is one of the chief's top priorities.
You could "accidentally" let it slip about how she's crushing on the geeky assistant swim coach or her secret fondness for playing Pretty Pretty Princess.
In the (copyrighted) words of rapper Eminem, Lawrence Lessig had one shot, one opportunity, one moment--and, Lessig admits, he let it slip.
Say, "Grandpa let it slip that you two had previous marriages.
As her sons threw snowballs at each other nearby, Orantes gathered handfuls of snow and let it slip softly through her fingers.