In an undetected way; silently and secretly.
The cat burglar entered the office by stealth, and the only evidence he was there was the missing document.
Frequently Asked Questions (FAQs)
The idiom ‘by stealth’ means “to deal with a difficult situation without being harmed or damaged”
Example usage of idiom ‘by stealth’: Newspapers have weathered the storm of online information by providing news online themselves.