a balloon or blimp, usually one of several anchored around a military area, city, etc., from which wires or nets are hung as a protection against attacks from low-flying aircraft.
Origin of barrage balloon
First recorded in 1920–25
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
one of a number of tethered balloons with cables or net suspended from them, used to deter low-flying air attack
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012