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thank–you–ma'am

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noun \ˈthaŋk-yu̇-ˌmam, -(y)ē-\

Definition of thank–you–ma'am

  1. :  a bump or depression in a road; especially :  a ridge or hollow made across a road on a hillside to cause water to run off



Origin and Etymology of thank–you–ma'am

probably from its causing a nodding of the head


First Known Use: 1849


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