To carry over is to keep something for a later period instead of losing it. Carry over the leave, carried over to next year, the balance carries over.
It belongs to holiday, budgets and losses, where the rules on what may carry over are worth knowing, since unused leave is often forfeited. It also means to persist, so a habit can carry over into another job.
1phrasecarry overTo keep something for a later period instead of losing it.
“You can carry over five days of unused holiday into next year.”
carry over is a transferring.
Carry plus over, attested since the seventeenth century in the sense of transferring a balance.
Latin
transfero
English, today
carry over
Attested since the 17th century; [https://www.google.com/books/edition/An_English_dictionary_1676/K_lmAAAAcAAJ?hl=en&gbpv=1&dq=carry+over+transfer+before:1700&pg=PP290&printsec=frontcover listed] for instance in Elisha Coles' 1676 dictionary as a translation of transfer, thereby possibly a Latin transfero; compare overdragen, übertragen.
Etymology from Wiktionary, CC BY-SA