EXFILTRATE is validvalid

[v EXFILTRATED, EXFILTRATES, EXFILTRATING] : EXFILTRATION [n]

127,749 of 196,601 in NWL2023·also valid in CSW24

to remove or withdraw (an intelligence agent, soldier, etc.) surreptitiously from an enemy-held area [v EXFILTRATED, EXFILTRATING, EXFILTRATES]