Occur (5)
'occur' is the definition.
(I know that happen is a more specific form of occur)
This is all the clue.
(Other definitions for happen that I've seen before include "Turn out" , "Take place" , "perhaps for Yorkshire" , "Occur" , "Come to pass" .)
'occur' is the definition.
(I know that befall is a more specific form of occur)
This is all the clue.
(Other definitions for befall that I've seen before include "Happen to (someone)" , "Happen, occur" , "Turn out" .)
'occur' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for exist that I've seen before include "Scrape by" , "Get a life!" , "Live" , "Have objective reality" , "Have being or continue living" .)
'occur' is the definition.
(arising is a kind of occuring)
This is all the clue.
(Other definitions for arise that I've seen before include "Become apparent" , "result" , "Get or stand up" , "Tower" , "Occur; stand up" .)