salvage: [17] The salvage of a ship is etymologically simply a payment made for ‘saving’ it. The word comes via Old French salvage from medieval Latin salvāgium, a derivative of late Latin salvāre ‘save’ (source of English save). The use of English salvage as a verb is a comparatively recent development, dating from the 1880s. => save[salvage etymology, salvage origin, 英语词源]
1640s, "payment for saving a ship from wreck or capture," from French salvage (15c.), from Old French salver "to save" (see save (v.)). The general sense of "the saving of property from danger" is attested from 1878. Meaning "recycling of waste material" is from 1918, from the British effort in World War I.