To enter deeply; to fall or retire beneath or below the surface; to penetrate.
To decrease in volume, as a river; to subside; to become diminished in volume or in apparent height.
fall or drop to a lower place or level; "He sank to his knees"
cause to sink; "The Japanese sank American ships in Pearl Harbor"
pass into a specified state or condition; "He sank into Nirvana"
go under, "The raft sank and its occupants drowned"
descend into or as if into some soft substance or place; "He sank into bed"; "She subsided into the chair"
appear to move downward; "The sun dipped below the horizon"; "The setting sun sank below the tree line"
fall or sink heavily; "He slumped onto the couch"; "My spirits sank"
embed deeply; "She sank her fingers into the soft sand"; "He buried his head in her lap"