subside

subside (http://definr.com/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]