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thank-you-ma'am

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noun \ ˈthaŋk-yu̇-ˌmam , -(y)ē- \

Definition of thank-you-ma'am

: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

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Origin and Etymology of thank-you-ma'am

probably from its causing a nodding of the head

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