late 14c., sauf-gard, "protection, security, defense," from Old French sauve garde "safekeeping, safeguard" (13c.), from salve, sauve (fem. of sauf; see safe (adj.)) + garde "a keeping" (see guard (n.)). Meaning "one who protects, something that offers security from danger" is recorded from late 15c.
"to guard, protect, keep secure from danger," mid-15c., from safeguard (n.). Related: Safeguarded; safeguarding.