אֲבֵדָה שֶׁאֵינָהּ חוֹזֶרֶת

ביטוי (אנגלית)

Irreparable loss / Irreplaceable loss

הגדרה (אנגלית)

Figuratively: a great loss; something that cannot be repaired or restored.

("For the month that the boy spends idly is a loss that cannot be recovered" — Sefer Or Zarua, Part 3, Rulings on Bava Metzia, §244)