I came across this sentence:
I know that いくcould mean 'to go' or 'to move' but I don't think it means something like that here.
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1 Answer
「いく」 here is a subsidiary verb, which is why it is written in kana. It is attached to the "main" verb 「蝕{むしば}む」 to form 「蝕んでいく」.
What 「いく」 does as a subsidiary verb is to express the increasing and/or continuing tendency of the action described by the main verb.
"to keep on (main verb)ing"
"to (main verb) more and more"
"(It turns into a) shapeless malice and continuously eats/ruins a human body from the inside."