A fanfiction in which several fandoms interact with one another.

Cross-overs largely involve time travel and interdimensional travel to meld two different fandoms.
I was confused when Dr. Gregory House was treating Harry Potter's illness, but I soon realized that I was merely reading a cross-over.
by Levstrong November 14, 2007
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Cross over
Verb

1. To go to the spiritual realm when one dies and leaves the body.
2. To make somebody's spirit (persons or living creatures) go to the spiritual realm.
1. Earthbound spirits have not crossed over because they have some unfinished business / I often think about how it shall be when I cross over into the light.

2. Melinda is a medium who sees and speaks to earthbound spirits and crosses them over.
by Ezechiel February 16, 2007
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when one has indulged in mind altering substances and moves to another state of mind
Far out bruz I crossed over hard last night, nummie nummies
by shujon March 23, 2015
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Cross Over ; is when a covert cop goes to far and can't come back. There denoted and deemed to be Common Criminals. An insult or reference to them is - "to fat, to coppish".
Let's say during a complicated covert opparation, the cop had to cross over knowing that there was no way back. He will not be able to be withdrawn from service, and therefore will be treated as a common criminal unless otherwise directed. With a name such as Ron Nicalson, who's now to fat and to coppish.
by Bryn Benn April 12, 2020
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The act of two men give each other hand jobs simultaneously, thier arms crossing making an "X"
Kyle and Fairman wanted it at the same time, so they did the cross over
by David Banners May 26, 2007
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When a teacher goes from being cool to not cool. Any kind of jumper or vest or bright colored blazer would be a symptom of crossing over
Mrs. Dante had the coolest shirt on yesterday and now she is wearing a jumper with letters all over it, she must have crossed over
by Harriet Potter September 23, 2004
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