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safeguard (n.)[safeguard 词源字典]: late 14c., "protection, safety," from Middle French sauvegarde "safekeeping, safeguard" (13c.), from Old French salve, sauve (fem. of sauf; see safe (adj.)) + garde "a keeping" (see guard (n.)). Meaning "something that offers security from danger" is recorded from late 15c.[safeguard etymology, safeguard origin, 英语词源]
sequester (v.): late 14c., "remove" something, "quarantine, isolate" (someone); "excommunicate;" also intransitive, "separate oneself from," from Old French sequestrer (14c.), from Late Latin sequestrare "to place in safekeeping," from Latin sequester "trustee, mediator," noun use of an adjective meaning "intermediate," which probably is related to sequi "to follow" (see sequel). Meaning "seize by authority, confiscate" is first attested 1510s. Alternative sequestrate (v.) is early 15c., from Latin sequestratus. Related: Sequestered; sequestering.
sequestrate: "Take legal possession of (assets) until a debt has been paid or other claims have been met", Late Middle English (in the sense 'separate from general access'): from late Latin sequestrat- 'given up for safekeeping', from the verb sequestrare (see sequester).