no flies on
idiom
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 29 Apr. 2024.
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