Dictionary![]() ![]() SOSthe letters represented by the radio telegraphic signal (••• – – – •••) used, esp. by ships in distress, as an internationally recognized call for help. —n. any call for help: We sent out an SOS for more typists. —v.i. to send an SOS. s.o.s.(in prescriptions) if necessary. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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