noun originally, cotton, or cotton wool.
2. bombast ·adj high-sounding; inflated; big without meaning; magniloquent; bombastic.
3. bombast ·vt to swell or fill out; to pad; to inflate.
4. bombast ·noun cotton, or any soft, fibrous material, used as stuffing for garments; stuffing; padding.
5. bombast ·noun fig.: high-sounding words; an inflated style; language above the dignity of the occasion; fustian.