noun figure; outline; show.
2. bosh ·noun empty talk; contemptible nonsense; trash; humbug.
3. bosh ·noun in forging and smelting, a trough in which tools and ingots are cooled.
4. bosh ·noun the lower part of a blast furnace, which slopes inward, or the widest space at the top of this part.
5. bosh ·noun 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.