From Middle English siker, sikker, sykkere, secre, seccre, from Old English sēocra, equivalent to sick + -er.
From Middle English siker, from Old English sicer, sicor, from Proto-West Germanic *sikur ("free, secure"), from Latin sēcūrus ("secure"). sure, and secure.
From Middle English *sikeren (attested only as sikeriez), from Old English sicerian, from Proto-Germanic *sikrōną, from Proto-Germanic *sīką. Akin to sitch.
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