thick as thieves

Meaning: Very close friends who share secrets.

Language: English

Literally: (Already vivid in English)

Example: “The two grandmothers are thick as thieves.”

Category: Daily Life

Origin: "Thick" has meant intimate since the 18th century, and thieves must trust each other. The comparison is found from the early 19th century.

Equivalents in other languages

More idioms — Daily Life

More English idioms

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