expression, godan verb (-su)
raise one's body; sit up; stand up
Used when moving from a lying or reclining position to a sitting or standing position. Often implies a deliberate action to get up.
朝、目が覚めてすぐに体を起こした。
In the morning, I woke up and immediately sat up.
彼はソファから
He straightened up from the sofa and began to listen.