资料来源 : pyDict

情况好转,向上的趋势(使)向上,转朝上,翻转

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Upturn \Up*turn"\, v. t.
   To turn up; to direct upward; to throw up; as, to upturn the
   ground in plowing. ``A sea of upturned faces.'' --D. Webster.

         So scented the grim feature, and upturned His nostril
         wide into the murky air.                 --Milton.

资料来源 : WordNet®

upturn
     n : an upward movement or trend as in business activity