@JeremyECrawford
Hi, Jeremy!
If an enemy can't see you, but knows you go behind a cover, does it means you can't use the Hide action?

— Moses Lord (@MosesLord777) July 13, 2017

Being hidden from someone means they can't see or hear you. They might know in general where you are, but you're still hidden. #DnD https://t.co/RvkPMPSgj5

— Jeremy Crawford (@JeremyECrawford) July 13, 2017