"Until we meet again, take good care!"

[JakubKubaP]

What does "A" at the beginning mean?

[Abelon5]

"A" in this idiom can be interpreted as "until" or "when." "Hui" translates to a meeting. "Hou" is "anew" or "again." Poetically, it is "Until the meeting is renewed." Or, just "Until meeting again." That is my personal take on it. The expression is one of my favorite because of its simple poetry. "A hui hou" or "Later Gator."

[Zach_Factor]

Why wouldn't you use "kakou" in this sentence?