blood chit
/ˈblʌd tʃɪt/noun
1 Military slang. A message carried by aircraft (also occasionally military) personnel, designed to protect them from harm if stranded in hostile territory, typically by offering a reward to local people for helping the service personnel to survive, or to return to their own lines unharmed. Also called gooly chit ( British ).
- For practical reasons such messages are sometimes printed on fabric or attached to garments..
2 British slang. A document signed by a person before embarking on a flight, surrendering the right to take legal action in the event of an accident (now historical ). Now in extended use.
Origin
1920s; earliest use found in World's Work. From blood + chit.