aes alienum

Literally, “another’s money”.

• (Classical Latin) IPA^(key): [ˈae̯s a.liˈeː.nũː]
• (modern Italianate Ecclesiastical) IPA^(key): [ˈɛs a.liˈɛː.num]

aes aliēnum n (genitive aeris aliēnī); third declension

1. borrowed money, debt
   • 44 BCE, Cicero, De Officiis 2.84:

     Quam ob rem ne sit aes alienum, quod rei publicae noceat, providendum est

     We should take care, therefore, that there is no debt that would endanger the common welfare

Third-declension noun (neuter, imparisyllabic non-i-stem) with a second-declension adjective.

• “aes”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
• “aes alienum” on page 71/1 of the Oxford Latin Dictionary (1st ed., 1968–82)