graze against (someone or something)
To lightly touch or brush against someone or something. The room was so crowded that I ended up grazing against a bunch of people on my way to the refreshment table. The feather grazed against my neck and made me shiver.
graze against someone or something
to brush or scrape against someone or something. The car grazed against the side of the truck. I grazed against an old man as I was jogging this morning.