Jewish Babylonian Aramaic

ˀḥr - to tarry, postpone (DJBA 105)

Cf. ˀaḥărōn - at the back; later on; last (HALOT 36).

PS
*ˀḫr - to be different; to be late (DRS 15, HALOT 34‒36, Kogan 2015: 388)