Moderate 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'
He managed to steal the treasure on the sly, leaving no trace behind.
On the sly, she slipped the secret message into his pocket without anyone noticing.
They planned the surprise party on the sly to keep it a secret from the birthday person.
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