the letters represented by the radio telegraphic signal (••• – – – •••) used, esp. 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.
(in prescriptions) if necessary.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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