Rauðum
Rauðum is the dative plural form of the Icelandic adjective rauður, which means red. In Icelandic, adjectives agree with the noun they modify in gender, number, and case, so the same base meaning yields different endings depending on context. Rauður is the masculine nominative singular form, rauð – the stem form used in other cases and numbers, with rauðir and rauðar serving as the masculine plural and feminine plural nominative forms, respectively. Rauðum is thus used specifically when the noun it describes is plural and in the dative case.
Etymology and cognates: The Icelandic word rauður comes from Old Norse rauðr, reflecting a common Germanic
Declension and usage: Adjectives in Icelandic decline to match the noun by gender, number, and case. Rauðum,
See also: Icelandic grammar, Icelandic adjectives, color words in Icelandic.