(1) To send outgoing signals back to the receiving side for testing purposes. See loopback address and loopback plug.
(2) To go back to the beginning of a subroutine in a program. See loop and infinite loop.
"loop back." YourDictionary, n.d. Web. 16 August 2018. <http://www.yourdictionary.com/loop-back>.
loop back. (n.d.). Retrieved August 16th, 2018, from http://www.yourdictionary.com/loop-back