brewing -
The quantity of a brew made in a single batch.
brewing -
The forming of a storm or the gathering of clouds.
Verb
brewing -
Present participle of brew.
Wikipedia
Brewing is the production of beer through steeping a starch source (commonly cereal grains) in water and then fermenting with yeast. Brewing has taken place since around the 6th millennium BC, and archeological evidence suggests that this technique was used in ancient Egypt. Descriptions of various beer recipes can be found in Sumerian writings, some of the oldest known writing of any sort.