Dictionary
band•wag•on
Pronunciation: (band'wag"un), [key]—
n.
1. a wagon, usually large and ornately decorated, for carrying a musical band while it is playing, as in a circus parade or to a political rally.
2. a party, cause, movement, etc., that by its mass appeal or strength readily attracts many followers:
After it became apparent that the incumbent would win, everyone decided to jump on the bandwagon. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.