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on the sly

phrase

: in a manner intended to avoid notice

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on the slopes
on the sly
on the/someone's/something's way out
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“On the sly.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/on%20the%20sly. Accessed 21 Dec. 2025.

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Last Updated: - Definition revised
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