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set one's sights on

Have as a goal, as in She's set her sights on law school. This expression alludes to the device on a firearm used for taking aim. [Mid-1900s]

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The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.