plunging
adjective uk/ˈplʌn.dʒɪŋ/ us/ˈplʌn.dʒɪŋ/
突然下跌的，猛降的
dropping suddenly or having a shape that drops a long way down
plunging sales figures 骤降的销售额
a dress with a plunging neckline (= having a deep curve at the neck to show part of the breasts) 低胸连衣裙