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\ ˈthaŋk-yu̇-ˌmam 
, -(y)ē- \
, -(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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The first known use of thank-you-ma'am was in 1849
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