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I'm a (something), not a (something else)
Used to emphasize one's status as a certain type of person to the exclusion of some other type. Modeled on the catch phrase of Dr. McCoy in the television series Star Trek, "I'm a doctor, not a (something)." A: "What do you think would be the best way to market our new app?" B: "Hey, don't ask me—I'm a programmer, not a salesperson." A: "Do you think you can repair the car?" B: "Lady, I'm a mechanic, not a miracle worker. This thing is totaled."
See also: not
The systemic discrimination against African Americans that occurred in the southern United States from the end of the American Civil War until the 1960s, in which black people were treated as a lower class of citizens than white people. Back during Jim Crow, a black person couldn't even use the same drinking fountain as a white person! Many are calling this systemic racism the "new Jim Crow."
1. adjective Excellent; very fine or pleasing. Primarily heard in US. Wow, you've really created a jim-dandy story here! Action, romance, comedy—it's got it all! I'm sure the plan seemed jim-dandy at the time, but you nearly got yourselves killed!
2. noun That which is very fine, pleasing, or excellent. Often used in the phrase "a jim-dandy of a," which can be used sarcastically to imply the opposite. Primarily heard in US. A: "How was your trip to Florida?" B: "Oh boy, it was a jim-dandy! It seemed like everything we did was even better than the last!" The company appears to be gearing up for a jim-dandy of a legal battle over the issue. Sounds like it's going to be a jim-dandy of a party next weekend.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
excellent. This is a jim-dandy knife. Where'd you get it? Tom: I'll meet you at six, OK? Charlie: That'll be jim-dandy.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.