thick as thieves

Etymology
From, first attested in 1827 as "thick as two thieves".

Adjective

 * 1)  Intimate, close-knit, tight.

Usage notes

 * Sometimes used with a connotation that the relationship has a suspicious or less than respectable quality.

Translations

 * Catalan: cul i merda, carn i ungla
 * Chinese:
 * Cantonese: 糖黐豆
 * Finnish:, kuin paita ja peppu
 * French:, ,
 * Hungarian:
 * Italian: culo e camicia, pappa e ciccia
 * Norwegian:
 * Bokmål:
 * Polish:
 * Portuguese:
 * Russian: водо́й не разольёшь
 * Spanish: como uña y mugre
 * Turkish: et tırnak