下か降こう線せん

noun

downward curve; declining trend

Often used figuratively for a decline in performance, popularity, or fortunes, as well as literally for a downward-sloping line on a graph.

• 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 on a downward trend.

• このグラフの下か降こう線せんは売うり上あげの減げん少しょうを示しめしている。

  The downward curve on this graph shows the decline in sales.