underburn

== English == === Etymology === From Middle English underbrennen (“to set on fire, burn up”), equivalent to under- +‎ burn. === Pronunciation === === Verb === underburn (third-person singular simple present underburns, present participle underburning, simple past and past participle underburned or underburnt) (transitive, obsolete) To burn up. (transitive) To burn too little. === Noun === underburn (plural underburns) The deliberate burning of surface fuel so as to leave the tree canopy intact.