Saver
来自Big Physics
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Middle English: from Old French sauver, from late Latin salvare, from Latin salvus ‘safe’. The noun dates from the late 19th century.
wiktionary
save + -er
etymonline
saver (n.)
c. 1300, "savior," agent noun from save (v.). Meaning "one who economizes" is 1540s; meaning "means of saving" is from 1660s.