subside
     v 1: wear off or die down; "The pain subsided" [syn: {lessen}]
     2: sink to a lower level or form a depression; "the valleys
        subside"
     3: sink down or precipitate; "the mud subsides when the waters
        become calm" [syn: {settle}]
     4: descend into or as if into some soft substance or place; "He
        sank into bed"; "She subsided into the chair" [syn: {sink}]
Source: WordNet® 2.0