Coarse, Course
The words coarse and course are homophones: they sound alike but have different meanings. "Originally, it is true, coarse and course were the same word. But the difference in spelling and in meaning emerged in the 18th century, and the words have long since gone their separate ways." (Bryan Garner, Garner's Modern American Usage; Oxford University Press, 2009).
The adjective coarse means rough, common, inferior, crude, or vulgar.
The noun course can mean several things, including path, playing field, mode of behavior, unit of study, and onward movement. As a verb, course means to move swiftly.
There are two significant idioms using course. The expression "on course" means going in the right direction, moving forward as expected, or following a plan correctly.
The expression "take (or run) its course" means to let something progress or continue without interference.
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