The story
- Middle English · inherited fromthos“those”
- English todaythose
From Middle English thos (“those”), alteration of tho pl (“the; those”), equivalent to tho (“the; those”) + -s (plural ending), partly by analogy with thes (“these”), whose final -s is original and not a plural ending. More at tho.
Etymology from Wiktionary, CC BY-SA 4.0.