expression
noble birth; high lineage
Rare, literary phrase meaning 'of noble birth' or 'high lineage'. In modern Japanese, 家柄の良い or 名門の出 are more common.
彼女はたっといいえがらの出だと言われている。
She is said to be of noble birth.
Compound of 貴い (たっとい, 'noble, precious') and 家柄 (いえがら, 'family lineage'). The kanji 貴 is a less common variant of 尊い in this context.