Marla lowered the sails while her husband radioed in an S.O.S. call because they couldn't outchase the storm.
S.O.S. is used as a distress call to request help. Traditionally, ships in distress would send the message S-O-S in Morse code when they needed assistance.
An example of S.O.S. is Bob sent out an S.O.S. when he and the twins all had the flu.
Origin of s.o.s.Classical Latin si opus sitPharmacy if necessary