What is the meaning of Gassing?

present participle and gerund of gas

Poisoning by noxious gas.

The liberation of hydrogen from an overcharged battery due to electrolysis of the electrolyte.

The process of passing cotton goods between two rollers and exposing them to numerous minute jets of gas to burn off the small fibres.

Any similar process of singeing.

boasting; insincere or empty talk

strong, healthy, powerful, mighty, highly capable

quite often, frequently

Source: wiktionary.org