thick as thieves
Intimate, closely allied, as in The sisters-in-law are thick as thieves. This term uses thick in the sense of “intimate,” a usage that is obsolete except in this simile. [Early 1800s]
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How to use thick as thieves in a sentence
But the people from Valley Stream had such a thick New York accent that was all around me.Coffee Talk with Fred Armisen: On ‘Portlandia,’ Meeting Obama, and Taylor Swift’s Greatness|Marlow Stern|January 7, 2015|DAILY BEAST
The Oscar-winning actress put nude photo thieves in their place with one perfect statement.Jennifer Lawrence’s Righteous Fury Says Everything We Wanted to Say|Kevin O’Keeffe|December 29, 2014|DAILY BEAST
His chin rested on the thick plastic collar buckled around his neck.Dungeons and Genital Clamps: Inside a Legendary BDSM Chateau|Ian Frisch|December 20, 2014|DAILY BEAST
At the highest navigable point of the Congo River, thick jungle creates an impenetrable wall of green around a large island.
Small rooms off its graffiti-covered foyer provide shelter from the thick rain that can unexpectedly, and vengefully, hit.
We stumbled along, close up, for the thick-piled clouds still hung their light-obscuring banners over the sky.
I'd admire to see him cavorting around on the pinnacles after horse-thieves or whisky-runners or a bunch of bad Indians.
The eyebrows were low and thick, the upper lip was sensitive, quivering sometimes as she talked, but the lower was firm and full.Ancestors|Gertrude Atherton
Cystin crystals are colorless, highly refractive, rather thick, hexagonal plates with well-defined edges.A Manual of Clinical Diagnosis|James Campbell Todd
Thy princes are faithless, companions of thieves: they all love bribes, they run after rewards.The Bible, Douay-Rheims Version|Various