其 drew a winnowing basket — the woven tray for tossing grain into the wind. Grammar borrowed it as the pronoun 'its/that', so the basket meaning grew bamboo on top and became 箕. The loanword kept the throne.
其他 'other', 其实 'actually', 尤其 'especially'. Classical Chinese leaned on 其 the way English leans on 'its'. In idioms it's everywhere: 名副其实 'the name matches its reality'.
A winnowing basket borrowed by grammar — ITS, THAT, the OTHER.
其实 'actually' is the gentle Chinese pivot before disagreeing — 其实我觉得... 'actually, I think...' softens a thousand daily debates.