noun, noun or participle which takes 'suru'
Literary and rare; used in classical or formal contexts. The kanji 偃 means 'to lie down' and 臥 means 'to lie face down'.
彼は疲れ果てて偃臥した。
He lay face down, exhausted.
偃臥して地面に耳
He lay face down and put his ear to the ground.