burnburnburns2nouna place on your body where fire or heat has hurt it: I've got a burn on my arm.burnburnburnsburnedburntburning1verb (burns, burning, burntor burned/, has burntor has burned)1to make flames and heat; to be on fire: Paper burns easily. She escaped from the burning building.2to harm or destroy somebody or something with fire or heat: I burnt my fingers on a match. We burned the wood on the fire.burn down, burn something downto burn, or to make a building burn, until there is nothing left: Their house burnt down.