0 a request for help, especially because of danger: --
The hospital sent out an SOS for extra blood supplies.
Within an hour of the ship transmitting an SOS (message/call), six boats had arrived and started a rescue operation.
1 (esp. from a boat or ship) an urgent request for help --
NYA ORD
European
May 10, 2021
DAGENS ORD
Shimmer
SOS