ὀφείλημα
From LSJ
δύο ἀρνήσεις μίαν συγκατάθεσιν ποιοῦσι → two negatives make an affirmative
English (LSJ)
ατος, τό,
A that which is owed, debt, Th.2.40, etc.; ἀποτίνειν ὀ. Pl.Lg.717b; ἀποδοτέον Arist. EN1165a3: also in Inscrr., IG12.57.14, SIG306.38 (Tegea, iv B. C.), 1108.11 (Callatis, iii/ii B. C.), etc.; and Pap., PHib.1.42.10 (iii B. C.), etc.; cf. ὀφήλωμα.