Advanced as in covertly Characterized by secrecy or stealth; done in a clandestine or discreet manner. Clear All
4 Example Sentences Showcasing the Meaning of 'On The Sly'
The spy gathered information on the sly, always staying undercover.
The artist added a hidden signature on the sly, a subtle mark only art experts could find.
On the sly, he altered the experiment's results to test the team's attention to detail.
The spy communicated with his handler on the sly to avoid detection.
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