Webster's Revised Unabridged Dictionary · 1913

Bosh

Bosh ({not transcribed}) , noun

[Compare German posse joke, trifle; Italian bozzo a rough stone, bozzetto a rough sketch, s-bozzo a rough draught, sketch.]

Figure; outline; show. [Obsolete]

Bosh , noun

[Turkish]

Empty talk; contemptible nonsense; trash; humbug. [Colloquial]

Bosh ({not transcribed}) , noun

[Compare German boschung a slope.]

1.
One of the sloping sides of the lower part of a blast furnace; also, one of the hollow iron or brick sides of the bed of a puddling or boiling furnace.
2.
The lower part of a blast furnace, which slopes inward, or the widest space at the top of this part.
3.
In forging and smelting, a trough in which tools and ingots are cooled.