What is the meaning of Eisen?

to demand

to claim

to require

plural of eis

to freeze

of iron

Rōmaji transcription of えいせん

of iron

first-person plural possessive, masculine object, nominative: our

first-person plural possessive, masculine object, accusative: our

first-person plural possessive, plural object, dative: to our

singulative of ais

Source: wiktionary.org