What is the meaning of Nexum?

A contract in early Ancient Rome in which the debtor pledged his own person as collateral should he default on his loan (thus risking becoming a slave to the creditor).

a bond secured upon the personal liberty of the debtor after having failed to cover for an earlier security, which made him a slave (nexus) of his master creditor

inflection of nexus:

1. nominative/accusative/vocative neuter singular
2. accusative masculine singular

nominative/accusative/vocative neuter singular

accusative masculine singular

accusative singular of nexus (substantive)

accusative singular of nexus (action noun)

Source: wiktionary.org