What is the meaning of Bombast?

Cotton, or cotton wool.

Cotton, or any soft, fibrous material, used as stuffing for garments; stuffing, padding.

High-sounding words; language above the dignity of the occasion; a pompous or ostentatious manner of writing or speaking.

To swell or fill out; to inflate, to pad.

To use high-sounding words; to speak or write in a pompous or ostentatious manner.

Big without meaning, or high-sounding; bombastic, inflated; magniloquent.

bombast; cotton or cotton wool

bombast

bombastic

Source: wiktionary.org