He buried his head in her lap.
He sank into bed.
He sank into nirvana.
He sank to his knees.
He slumped onto the couch.
My spirits sank.
She sank her fingers into the soft sand.
She subsided into the chair.
The Japanese sank American ships in Pearl Harbor.
the ocean is a sink for carbon dioxide.
The raft sank and its occupants drowned.
The real estate market fell off.
The setting sun sank below the tree line.
The sun dipped below the horizon.