no flies on

idiom

Definition of no flies on

chiefly British, informal

—used to describe someone as quick to understand things and not easily fooled That chap is brilliant—there are no flies on him.

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“No flies on.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/no%20flies%20on. Accessed 6 Mar. 2021.

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