covering with a design in which one element covers a part of another (as with tiles or shingles)
"The roofers installed the new shingles so that each row overlaps slightly to ensure no water can seep through."
The situation in which things overlap.
"The overlapping of his schedule and mine made it impossible for us to meet on Tuesday afternoon."
present participle of overlap
"The two schedules were overlapping, so we had to find a new time for our meeting."
That overlaps something else
"The two meeting schedules were overlapping, so I had to reschedule my call to avoid the conflict."