第三人称单数：数：lessens
过去分词：lessened
过去式：lessened
减轻，减少，变小；变少( lessen的现在分词 )；减少；
1. 减轻：lessened 减少的 | lessening 减轻 | lesser 较小的
2. 减小、变小：less-common element稀有元素 | lessening减小、变小 | less important work辅助作业、辅助工作
3. 减少：lenient 宽大的;仁慈的 | lessening 减少 | lesser 更少的;次要
noun
1. a change downward
e.g. there was a decrease in his temperature as the fever subsidedthere was a sharp drop-off in sales
Synonym: decreasedrop-off
