Probably a direct translation of similar Chinese terms, most prominently 到, (pinyin) dào, but also equivalent terms in other languages such as Hokkien 甲, kah.
expand for detailsDetailed etymology
definitions
preposition
to; towards
Walk until Haji Lane first, then go inside the small alley there.
to the point of
Alamak funny sia this one, I laugh until cannot take it already.