to put (wood, coal, paper, etc.) into the fire; to throw on the fire; to add to the fire; to burn
暖炉に薪をくべて暖まった。
I put firewood in the fireplace and warmed up.
焚き火に枯れ葉をくべる。
I feed dried leaves into the bonfire.
父は囲炉裏に薪をくべた。
Dad put firewood into the hearth.