thick as thieves
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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 This term uses thick in the sense of “intimate,” a usage that is obsolete except in this simile.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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Words nearby thick as thieves
thiazole, Thibodaux, thick, thick and fast, thick and thin, thick as thieves, thick client, thicken, thickener, thickening, thicket
The American Heritage® Idioms Dictionary
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