thick as thieves

1. 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 This term uses thick in the sense of “intimate,” a usage that is obsolete except in this simile.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]

Example Sentences

The two used to be “thick as thieves,” he said.

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"They were thick as thieves," explains Harsha Evangeli, who taught the teenager art.

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Joey King, who plays youngest daughter Halina, values having a close relationship with her grandmother and says they are “thick as thieves.”

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Mr. Luttrell recalled that he and his peers were “thick as thieves” on the campaign trail.

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The lyrics: “Now she gets the house, gets the kids, gets the pride / Picture me thick as thieves with your ex-wife.”

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Related Words

• dear 
• devoted 
• familiar 
• related