Burn out (verb)
v. The act of setting fire inside a control line to consume fuel between the edge of the fire and the control line (NWCG 2005).
Burning out reduces the likelihood that the main fire will cross a control line by consuming fuel between the main fire and the constructed fireline. Burning out is a common fire suppression tactic associated with parallel fireline construction (that is, any line not constructed directly at the current fire edge). The resulting burned area is called the burnout .
Burning out differs from backfiring in that it is not conducted under the influence of the main fire or intended to influence the behavior of the main fire, except at the control line.