Merriam-Webster Collegiate Dictionary - prostrate

 I. adjective  Etymology: Middle English prostrat, from Anglo-French, from Latin prostratus, past participle of prosternere, from pro- before + sternere to spread out, throw down — more at strew  Date: 14th century  1. stretched out with face on the ground in adoration or submission; also lying flat  2. completely overcome and lacking vitality, will, or power to rise was ~ from the heat  3. trailing on the ground ; procumbent ~ shrubs  Synonyms: see prone  II. transitive verb  (~d; prostrating)  Date: 15th century  1. to throw or put into a ~ position  2. to put (oneself) in a humble and submissive posture or state the whole town had to ~ itself in official apology — Claudia Cassidy  3. to reduce to submission, helplessness, or exhaustion was ~d with grief