θίς

1. a heap , (Odyssey by Homer):—;in plural sand-heaps, sand-bank , (Herdotus Historicus), etc.

2. the beach, shore , παρὰ θῖνα θαλάσσης (Iliad by Homer); παρὰ θῖν᾽ ἁλός (Iliad by Homer); so, ἐπὶ θινί (Odyssey by Homer)

3. sand or mud at the bottom of the sea, οἶδμα κυλίνδει βυσσόθεν θῖνα (Sophocles Tragicus); metaphorically, τὸν θῖνά μου ταράττεις you trouble the very bottom of my heart, (Aristophanes Comicus) (ML)