From buwc; a trampling -- treading (trodden) down (under foot).
see HEBREW buwc
H4001. mebusah
מְבוּסָה noun feminine down-treading, subjugation, וּמְבוּסָה קַוקַֿו גּוֺי Isaiah 18:2, 7 a nation of might and of down-treading (Che all-subduing); ׳וּמ וּמְבוּכָה מְהוּמָה יוֺם 22:5, compare מְבוּכָה below בוך.