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1. slang A first-year student, as in high school or college. The word comes from "freshman." Hey, tell the frosh to get in here for this announcement. Back when I was a frosh, I wanted to major in bio, but now I'm not so sure.
2. slang Relating to first-year students. Hey, tell the frosh field hockey players to get in here for this announcement. When does frosh orientation start?
1. n. a freshman. Ken is just a frosh, but he looks older.
2. mod. having to do with freshmen. The frosh dorm is full again this year.