Advanced as in underground Characterized by secrecy or stealth; done in a clandestine or discreet manner. Clear All
3 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.
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