The story
From thick (“friendly, intimate”), first attested in 1827 as "thick as two thieves".
Etymology from Wiktionary, CC BY-SA 4.0.
thick as thieves
Today it means: Intimate, close-knit, tight. Full definition →
Today it means: Intimate, close-knit, tight. Full definition →
From thick (“friendly, intimate”), first attested in 1827 as "thick as two thieves".
Etymology from Wiktionary, CC BY-SA 4.0.