Government Business
Official Business
noun
A public task is going to be government business. You have to think of this public as government to know the meaning of this word easily.
こうよう
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
今、公用でパリにきています。
I’m coming to Paris now on official business.
これは公用のアカウントです。
This is an official account.
おれたちがぬすむのは公用のかねだ。
We’re gonna steal government money.