伏せる
ふせる
to lie (one's body) face down, to lie flat (on the ground), to point downwards (eyes, head, etc.), to cast down (eyes), to lie down, to retire, to go to bed (with an illness), to turn over (face down), to lay face down, to lay upside down, to conceal, to hide, to keep secret, to place in hiding (e.g. troops for an ambush)