1. the tail of a fish
2. something shaped like a fish’s tail

1. to swing the rear end of a vehicle from side to side in an uncontrolled way

Examples

• The goldfish had a beautiful orange fishtail.
• She wore a dress with a fishtail hem.
• The car began to fishtail on the icy road.
• The driver lost control when the truck started to fishtail.
• The fishtail braid is a popular hairstyle.
• His motorcycle began to fishtail in the gravel.
• The wedding dress featured an elegant fishtail silhouette.