The thicker end of anything. See But end, under 2d But.(noun)
Gnu Collaboartive International Dictionary of English: licensed under The Code Project Open License (CPOL)
Use "butt end" in a sentence
"The Bactrian cavalry under his kinsman Bessus were with him from the beginning, along with his closest relatives and his personal guard, known as the Spearmen of the Golden Apples for the fruit-shaped bulbs at the butt end of their weapons."
"I durst not answer, so he followed up his complaint by laying hiscane about my head and shoulders; he then took the butt end of his whip, and struck me some violent blows on my forehead, which felled me to the ground, bleeding most dread fully."
" Ashnod leaned her black thunderwood staff forward and pressed its butt end against the disk."