1. to secretly remove or extract (a person, especially a spy or operative) from a place, typically a hostile or dangerous location
Usage: military/intelligence context; transitive verb
2. to secretly remove or transfer (data, documents, or other information) from a secure system or location
Usage: cybersecurity/espionage context; transitive verb

Examples

• The special forces team was tasked with exfiltrating the diplomat from the war zone.
• Intelligence agents worked to exfiltrate the undercover operative before his cover was blown.
• Hackers attempted to exfiltrate sensitive customer data from the company's servers.
• The whistleblower helped exfiltrate classified documents to journalists.
• Military planners developed a strategy to exfiltrate personnel from the besieged compound.
• Cybersecurity experts discovered that attackers had exfiltrated proprietary research files.