Closer
来自Big Physics
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Middle English: from Old French clos (as noun and adjective), from Latin clausum ‘enclosure’ and clausus ‘closed’, past participle of claudere .
wiktionary
closer
From Middle English closere, equivalent to close(verb) + -er.
etymonline
closer (n.)
"one who or that which closes" anything, 1610s, agent noun from close (v.).