1520s, from Latin past-participle adjective effusus "poured out," also "extensive, vast, broad, wide" (see effuse (v.)).
"to pour out, spill," late 14c., from Middle French effuser or directly from Latin effusus "poured out," past participle of effundere "pour forth, spread abroad; to lavish, squander, waste," from assimilated form of ex "out" (see ex-) + fundere "to pour" (from nasalized form of PIE root *gheu- "to pour"). Related: Effused; effusing. Not to be confused with eff youse.
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