Wiktionary
vb. To seek acquaintance without a formal introduction.
Usage examples of "scrape acquaintance".
It was accepted that any young woman with whom one could scrape acquaintance in a park, a dance hall or any public place was fair game, and that if she allowed herself to be seduced a 'gentleman' was under no obligation to marry her.
You're not the sort to scrape acquaintance, or else I miss my shot!
Ireland had never harmed him at the Academy, and if he wanted to scrape acquaintance now with the Hero of Kostroma, well, that wasn't a terrible crime.
He would go into the pub, he would scrape acquaintance with that old man and question him.
They would not like to be seen by their neighbors as seeming to scrape acquaintance with those of fame or rank.
And Madison fell back to scrape acquaintance with the man of millions.
He noticed me a lot on the boat (I had a perfect love of a Redfern coat to wear on deck), but he didn't try to scrape acquaintance with me.