What does graze do

So im rocking theese mod things and I noticed some are kinda like wepon specials for example one that does - 1 ap to the enemy but I got one called graze and applied it to koa and he just grazed hella lot like it pooped up graze over koas head. What does this graze mod do

Graze is damage reduction according to @Akearns and his auxiliary mod thread:

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