The Collaborative International Dictionary of English v.0.48:
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. [1913 Webster] So scented the grim feature, and upturned His nostril wide into the murky air. --Milton. [1913 Webster]WordNet (r) 3.0 (2006):
upturn n 1: an upward movement or trend as in business activity