Handler
来自Big Physics
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wiktionary
From Middle English handler, handiller, equivalent to handle + -er.
etymonline
handler (n.)
late 14c., "one who handles" anything, agent noun from handle (v.). Specific sense of "one engaged in trade" is from 1690s; that of "prizefighter's assistant" (1916) was earlier used in reference to dogfights and cockfights (1825).
