See let slip out.
Also, slip away or off. Leave quietly and unobtrusively, as in She slipped out without telling a soul, or Let's slip away before the sermon, or Jason and Sheila slipped off to Bermuda. The use of slip with away dates from about 1450; out from the first half of the 1500s; off from the mid-1800s.
Words nearby slip out
How to use slip out in a sentence
I know that Detroit is losing market share in auto sales, but how did they let the Motown sound slip out of their hands?The Best Albums of 2014|Ted Gioia|December 13, 2014|DAILY BEAST
Those are the first words that slip out of my mouth when I greet Andrew Garfield at a hotel suite in Downtown Toronto.Andrew Garfield on the Evils of Capitalism, the Hacking Scandal, and Criticism of ‘Spider-Man 2’|Marlow Stern|September 10, 2014|DAILY BEAST
Patients often become frightened of moving suddenly because of a concern the tube might slip out.The Writhing, Miserable Reality of Force Feeding at Guantánamo Bay|Kent Sepkowitz|May 2, 2013|DAILY BEAST
What the economist does is to slip out of the difficulty altogether by begging the whole question.The Unsolved Riddle of Social Justice|Stephen Leacock
"If slightly cut before cooking, potatoes slip out of their skins easily," says a home journal.
Since he had decided to 'slip out' this attitude towards his cousin was necessarily involved.The Wave|Algernon Blackwood
If a knock came to the door, Willy would slip out to the wood-house before we opened it, lest it might be anybody coming in.Elster's Folly|Mrs. Henry Wood
But Raf's own inclination was to slip out and do some exploring in those underground corridors beyond.Star Born|Andre Norton