thy, poss.a.1Do (lenites), d' before vowels. Thy son, do mhac. Thy father, d'athair. 2Do chuid folld. by gen.; used commonly with mass-nouns, abstracts, and pls. Thy money, work, children, do chuid airgid, oibre, leanaí. 3aArticle + s. + agat. Thy eldest son, an mac is sine agat. bArticle + s. + seo agatsa. Thy house, an teach seo agatsa. 4(Stressed) Do . . . -sa, -se; an . . . agatsa. It is thy son who has come, is é do mhacsa a tháinig. Thy money, do chuidse airgid; do chuid airgidse. Thy eldest son, an mac is sine agatsa.