subcavus
From LSJ
ἤ με φίλει καθαρὸν θέμενος νόον, ἤ μ' ἀποειπών ἐχθαιρ' ἀμφαδίην νεῖκος ἀειράμενος → either love me with a pure heart, or reject and hate me, and openly pick a fight
subcăvus,¹⁴ a, um, creusé intérieurement, creux : Cato Agr. 151, 3 || souterrain : Lucr. 6, 557.