Submersion refers to the act or state of being submerged, which means to be completely covered by a liquid. This can happen when an object is fully immersed in water or another fluid, such as when you dive underwater or put your head beneath the surface of a body of water. Submersion can also refer to something that has been absorbed or engulfed by something else, like being submerged in work or being submerged in grief after losing someone close to you. In this sense, submersion means being completely overwhelmed or consumed by a particular emotion, experience, or task.