lessen (
http://definr.com/lessen)
v 1: decrease in size, extent, or range; "The amount of homework
decreased towards the end of the semester"; "The cabin
pressure fell dramatically"; "her weight fall to under a
hundred pounds"; "his voice fell to a whisper" [syn:
decrease,
diminish,
fall] [ant:
increase]
2: make smaller; "He decreased his staff" [syn:
decrease,
minify]
[ant:
increase]
3: wear off or die down; "The pain subsided" [syn:
subside]