伏せる

1. ichidan verb, transitive to lay (something) face down; to place upside down; to turn over (face down)
2. to point downwards (one's eyes, head, etc.); to cast down (one's eyes)
3. ichidan verb, transitive, intransitive to lay (oneself) face down; to lie face down; to lie flat (on one's stomach); to throw (oneself) to the ground
4. ichidan verb, transitive to conceal; to hide; to keep secret; to place in hiding (e.g. troops for an ambush)
5. to bring (someone) down; to kill
6. ichidan verb, intransitive, also written as 臥せる to lie down (and sleep); to go to bed (with an illness)

also 臥せる

1. godan verb, intransitive to lie down (and sleep); to go to bed (with an illness)