ὑποχάσκω · hypochaskō — LSJ
gape a little, Ar. Pl. 314, X. Eq. 6.8; κακὸν ὑποχάσκειν it is bad for the patient to have the mouth a little open, Hp. Epid. 4.46; μικρὸν ὑποκεχηνυῖαι τὸ στόμα Ach.Tat. 1.1; σῦκα ὑ. open a little (as they ripen), Philostr. Im. 1.31.