fall off the turnip truck

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fall off the turnip truck (third-person singular simple present falls off the turnip truck, present participle falling off the turnip truck, simple past fell off the turnip truck, past participle fallen off the turnip truck)

1. (chiefly US, stative, idiomatic) To be naive, uninformed, or unsophisticated, in the manner of a rustic person.
   • 2006 February 14, “Opinion: The Picture of Stupidity”, in New York Daily News, retrieved 16 September 2008:

     Doesn't it strike you as funny that this city, which prides itself on its erudition and sophistication, can oftimes get suckered like a bumpkin who just fell off the turnip truck?

• Often used in the past tense and preceded by "just."

• be born yesterday
• fall off a truck