To make unlike; to cause to differ or become dissimilar; to change the appearance or character of something.
From 'dis-' (prefix reversing) + 'liken' (from 'like', from Old English 'gelica', meaning alike or similar) + '-en' suffix. The '-en' makes it a verb meaning to make or become.
While 'dislike' means to have negative feelings, 'disliken' means to make something unlike something else—it's a completely different word sharing the 'dis-' prefix, showing how prefixes can attach to different roots to create entirely new meanings.
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