The word "翻过" is formed by combining the character "翻", which functions as a verb meaning to turn over or flip, with the character "过", which acts as a grammatical particle indicating completion or past experience; here, "过" serves as a complement to "翻", creating a compound that specifically denotes the action of having turned over, flipped, or crossed something, such as in the phrase "翻过一座山" (to have crossed over a mountain).