Overlap

[Mark Zuckerberg]

The lapping of one thing over another; as, an overlap of
six inches; an overlap of a slate on a roof.

[Sonia]

When one is in a relationship that both people know is ending and one of the two people starts to look for another relationship. This could be described as [cheating] but is usually not recognized as such as both people know that the end of the current relationship is emminent.

[Rihanna]

When two people have hooked up with at least one person in common, usually used when the number is a lot more.

[PussyCat]

noun - the occurance of dating two people at one time, when one relationship is ending and anther is beginning.

verb - to have two dating relationships that are beginning and ending concurrently.

[Raeanne Dimick]

To occupy the same area or have something in common. It doesnt really have another definition, but fools laugh when they hear the word.

[Sonia]

Extend over so as to cover partly.