noun Australia and New Zealand Informal.
Examples from the Web for silvertail
The most forgetful squirrel in the wood was called Silvertail.The Tale of Timmy Tiptoes|Beatrix Potter
You're a lad of penetration, Bill; now saddle me Silvertail as fast as you can.Matilda Montgomerie|Major (John) Richardson
Lollypop and Silvertail got well away, but the young horse merely pawed the air.
I didn't relish the task very well, as I was rather cold, and old Silvertail was full of his mischief.Wreaths of Friendship|T. S. Arthur and F. C. Woodworth
Boy tapped Silvertail with such an increase of emphasis that the old mare snatched resentfully at her bit.