It is known as desertion.
Absent Without Leave
to take the French leave is to depart without ceremony, or without asking a permission, or aking care that no one notices that you are leaving. In french this is called "filer à l'anglaise" (to leave the English way)
AOL Absent WithOut Leave unauthorized leave
to battle them
The last episode of the season, Pokemon Battle Frontier. Its titled "Home is Where the Start is!"
Press f5
AOL Absent WithOut Leave unauthorized leave
in the modern U.S if a soldier is not present they are considered AWOL absent without leave. But in general they are called deserters.
absent Absent WithOut Leave = A.W.O.L.
Splanchnic nerves
Leave without pay (LWOP)
Well that is simply impossible, but if you take care of it, it will leave an egg and be born again. This is called reincarnation.