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major in (something)
To complete a college or university degree with a particular subject as its focus. Originally I thought I would major in English literature, but I switch to psychology in my second year. Samantha's majoring in economics, with a minor in history.
An area, echelon, or sphere of great competition, success, power, achievement, etc. Refers to the major leagues of sports teams. I know you're new here, but you need to perform much better if you want to stay in this law firm. You're in the major leagues now. Welcome to the major league of politics, senator.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
major in something
to specialize in a certain subject in college. I majored in history in college. I want to major in math.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
To complete a long-term course of study in some subject that is one's main focus: In high school I was interested in math, but in college I majored in history.
The American Heritage® Dictionary of Phrasal Verbs. Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
mod. excellent; serious; severe. (Collegiate.) This rally is, like, major! Nick is a major dweeb.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.