Etymology

From Middle Irish fúasclaid ‎(“releases, delivers; redeems; relieves, assuages; solves”), a late form of fúaslaici, fúasailci ‎(“looses, opens, sets free; releases, delivers; redeems; loosens; dissolves, annuls”) formed by metathesis, probably from Old Irish do·fuasailci ‎(“loosens, relaxes; sets free, releases; dissolves, resolves (into constituent elements); unsheathes; solves (a question, etc.); relaxes, remits (bondage, an obligation, etc.); dissolves, destroys”), through loss of the first preverb.