下か降こう線せんMeaningsNoun1. downward curveKanji used下below降descend線linePitch accentかこうせんComposed of下か降こうdescent; fall; drop; decline; downturn; subsidenceNoun線せんline; stripe; stria; line (e.g. telephone line); wire; ray (e.g. X-ray); beam; line (e.g. of a railroad); track; route; …NounExamples1彼かれの人にん気きは下か降こう線せんをたどっている。His popularity is falling.