Being deeply absorbed or immersed in something; a state of concentrated attention (often used as 没入する).
彼は仕事に没入して、気づいたら夜になっていた。
He became absorbed in his work and realized it was night before he knew it.
VRはユーザーを仮想世界に没入させる力が強い。
VR strongly immerses users in the virtual world.
読書に没入することで、時間を忘れることがある。
When you become absorbed in reading, you can sometimes forget the time.
Sinking into or submerging (literally). Also used figuratively for sinking into a state or condition.
古い船は波に飲まれて没入してしまった。
The old ship was swallowed by the waves and sank.
その事件以来、彼は絶望に没入して日常生活が乱れた。
Since that incident, he sank into despair and his daily life fell apart.