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3.
The opposite of overlap, which technically means to skip or miss a part of something.
My fucking retarded teacher underlapped the design project, so we couldn't get it all.
by EC April 23, 2003
 
1.
(proposed definition)

Two areas underlap when there is a gap between them - rather than just touching.
When hanging wallpaper, you should arrange the sheets so that they neither overlap nor underlap.
by Ed Avis June 21, 2003
 
2.
to support from below; having strengths that work together without conflict
His personality underlapped hers and strengthened their team.
by Dennis P Ryan January 24, 2009