1. laid back, laid on one's back , πέσεν ὕπτιος he fell backwards , opposite to πρηνής, (Iliad by Homer); of a quadruped, ὀρθοῦ ἑστεῶτος καὶ ὑπτίου rearing upright and falling backwards , (Herdotus Historicus)

2. generally with the under side uppermost , χείρ ὑπτία the hollow of the hand, (Plutarch); ἐξ ὑπτίου κράνους from the upturned helmet, with the hollow uppermost , (Aeschulus Tragicus); so, παράθες ὑπτίαν τὴν ἀσπίδα); (Aristophanes Comicus); ἀψὶς ὑπτία a half-wheel with the concave side uppermost , (Herdotus Historicus); ὑπτίοις σέλμασιν ναυτίλλεται he sails with the bottom uppermost , i. e. suffers shipwreck, (Sophocles Tragicus); ἐξ ὑπτίας νεῖν to swim on the back (in metaphorically sense), (Plato Philosophus)

3. of land, sloping evenly , of Egypt, (Herdotus Historicus) (ML)