God (only) knowsspoken a) ANNOYused to show that you are annoyed because you do not know something, or because you think that something is unreasonable 天晓得〔表示生气〕God (only) knows who/what/how etc God knows what she’s doing in there. 天晓得她在那儿干什么。
b) LOT/VERY MUCHused to emphasize what you are saying 上天为证〔表示强调〕 God knows, it hasn’t been easy. 老天爷为证，这事不容易啊。
→ God (only) knows at god(7)