Prostrate means lying face down, or completely overcome. Fall prostrate, prostrate with grief, prostrate themselves.
The posture is one of submission or worship, which is why the verb, to prostrate yourself, is about the meaning rather than the movement. It is a different word from prostate, the gland, and the two are confused constantly.
1adjectiveprostrateLying face down, or completely overcome.
“Prostrate with grief, she could not leave her bed for days.”
prostrate is a position.
PROSTrate → face down in the FROST
He is face down on the grass with the frost still on it.
hooks ontofrost
Latin prosternere means to throw down in front, from pro-, before, plus sternere, to spread out.
Proto-Indo-European
*sterh₃-
Latin
prōstrātus
English, today
prostrate
Built from
From Middle English prostrat (“prostrate”), borrowed from Latin prōstrātus, perfect passive participle of prōsternō (“to prostrate”). Participial usage up until Early Modern English.
Etymology from Wiktionary, CC BY-SA