The phrase "burning bridges" is believed to have originated in ancient warfare. Soldiers would burn the bridges behind them to prevent the enemy from pursuing them or retreating. Metaphorically, the phrase now refers to cutting off all ties and leaving no possibility for reconciliation or return.
the Garth Brooks song of course. :)
http://www.cowboylyrics.com/lyrics/brooks-garth/burning-bridges-5005.html
Answer: The concept of not burning your bridges predates Garth Brooks.
Burning Bridges EP was created in 1999.
The Burning Bridges Tour was created on 2005-04-26.
Burning Bridges - film - was created on 1928-09-30.
Bridges Worth Burning was created on 2002-08-06.
Burning Bridges - 1928 was released on: USA: 30 September 1928
Burning Bridges - Arch Enemy album - was created on 1999-05-21.
Burning Bridges - 1990 - TV was released on: USA: 6 May 1990
Burning Bridges - Status Quo song - was created on 1988-11-21.
Burning Bridges - 2013 was released on: USA: 9 September 2013 (Los Angeles, California)
Yes. Under is a preposition and bridges is the object of under; therefore under bridges is a prepositional phrase.
Burning Bridges - 1996 was released on: USA: 1 February 1996 (Hof International Film Festival)
Burning Bridges - 2011 I was released on: USA: 1 October 2011 (Screenwriter's Workshop Annual Meeting)