With the face or front surface turned downward; lying prone, or confronting something directly.
Compound of 'face' (the front of the head) and 'down' (toward the ground). Used since at least the 1800s as both adjective and adverb.
In card games, laying cards facedown is the foundation of bluffing—hidden information changed games forever and is why poker became psychologically complex, not just mathematical.
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