yes, the kokugos are often horrendous for that

Unidic
Daijr: (擺脱 entry): 取り去ること。除き去ること。
(禊祓 entry): 人々の罪や穢けがれを除き去る神事。 
除き去る	1045

Seems to be mainly used in religious contexts.  I'm getting the meaning from the way it is used.
(Lexicography texts say that one should never use a term in an explanation which is not covered by the dictionary itself, however the kokugos frequently break that "rule".)