Wiktionary
n. 1 A solitary, old, male elephant that has become dangerously and unpredictably violent 2 (context by extension English) Someone or something that is large, dangerous, and unpredictable
WordNet
n. a wild and vicious elephant separated from the herd
Usage examples of "rogue elephant".
You see what I mean - the man was plainly must,*(*Must is the madness of the rogue elephant.
And if that wasn't enough, I was to sneak about some savage Indian kingdom (Thug country, for a bonus), spying on some withered old bitch of an Indian princess and trying to wheedle her to British interest against her will - and she probably the kind of hag whose idea of fun would be to chain malefactors to a rogue elephant's foot.
The french door and the locked screen outside looked as though a rogue elephant had passed that way.
He and Coulter were more hyenas to the other's rogue elephant, but his lip curled in an ugly smile.
He and Coulter were more hyenas to the others rogue elephant, but his lip curled in an ugly smile.