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"death," early 14c., from Old French deces (12c., Modern French décès) "decease, death," from Latin decessus "death" (euphemism for mors), also "a retirement, a departure," from decess-, past participle stem of decedere "die, depart, withdraw," literally "to go down," from de- "away" (see de-) + cedere "go" (see cede). Still used with a tinge of euphemism.
"to die," early 15c., from decease (n.). Related: Deceased; deceasing