variant of 卒[zu2]
Depicts clothing (衣) with intersecting lines indicating that the clothing is done being sewed. Based on the original meaning, "to finish sewing clothes". The meaning later shifted to "to finish" and "to die" while its other meaning "soldier" is a phonetic loan.
《說文》：“卒，隸人給事者衣為卒。卒，衣有題識者。”
to finish sewing clothes