- the letters represented by the radio telegraphic signal (· · · – – – · · ·) used, especially by ships in distress, as an internationally recognized call for help.
- any call for help: We sent out an SOS for more typists.
- to send an SOS.
- shit on a shingle (a euphemistic initialism used to avoid explicit vulgarity).
- (in prescriptions) if necessary.
- an internationally recognized distress signal in which the letters SOS are repeatedly spelt out, as by radio-telegraphy: used esp by ships and aircraft
- a message broadcast in an emergency for people otherwise unobtainable
- a call for help
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