huó​kǒu

surviving witness

活口 huó​kǒu
surviving witness noun
a person who witnesses a crime and is not killed by the perpetrator

To leave no witnesses, the killer brutally murdered all of the onlookers.

captured informant noun
a captive taken alive to provide intelligence or information

The reconnaissance squad captured a live prisoner in last night's ambush.

Frequency

Movie subtitles
2.80 per million appears in 1% of films
Written text
0.598 per million

Sources

Definitions
CC-CEDICT