"to pour out, spill," late 14c., from 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.
1520s, from Latin past-participle adjective effusus "poured out," also "extensive, vast, broad, wide" (see effuse (v.)).
updated on December 07, 2020