tie tack definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
☆ or tie tac
an ornamental pin with a short point that fits into a snap, used to fasten a necktie to the shirt front
tie tack definition by American Heritage Dictionary
A short pin with a decorative head, used to attach a tie to a shirt front by means of a snap or chain.