IPA: /ˈfeɪsˌdaʊn/
KK: /ˈfeɪsˌdaʊn/
In a way that the front or surface is facing downward, usually for viewing or placement.
He placed the book facedown on the table to keep the cover clean.
The word 'facedown' is formed from 'face' (from Old French *face*, meaning the front or surface of something) and 'down' (meaning in a lower position). The term 'facedown' describes a position where the front or surface is facing towards the ground.
Think of the 'face' as the front of something and 'down' indicating a lower position — that's why facedown means the front is facing down.