n. 1 (also butt-end) the thicker end, esp. of a tool or a weapon (gun butt). 2 a the stub of a cigar or a cigarette. b (also butt-end) a remnant (the butt of the evening). 3 esp. US sl. the buttocks. 4 (also butt-end) the square end of a plank meeting a similar end. 5 the trunk of a tree, esp. the part just above the ground. butt weld a weld in which the pieces are joined end to end.
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