expression, pre-noun adjectival
Pre-noun adjectival phrase meaning 'our', used before a noun to indicate possession or association with the speaker's group. Often carries a sense of pride or familiarity, as in 'our team' or 'our company'.
我らが母校の校歌を歌おう。
Let's sing the school song of our alma mater.
我らがチームは今年こそ優勝するぞ。
Our team will win the championship this year for sure.
Combination of 我ら (ware-ra, 'we') and the archaic possessive particle が (ga). The form 我ら is the plural of 我 (ware, 'I, oneself'), with the suffix ら indicating plurality. The possessive が is an older genitive particle still found in fixed expressions and place names.