thank–you–ma'am

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

probably from its causing a nodding of the head

First Known Use: 1849

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