underlap-ping是underlap的现在分词

underlap

美 
英 
  • v.使(某物)局部置于[延伸于](另一物)之下
过去式：underlapped  现在分词：underlap-ping  

英汉

v.
1.
使(某物)局部置于[延伸于](另一物)之下;(伸展时)使部分重叠