Pronunciation: [ɡˌə͡ʊ bˈad] (IPA) 
The spelling of the phrase "go bad" follows the general phonetic rules of English. The sound /gəʊ/ represents the "oh" sound, while /bæd/ represents the "b" sound followed by the "a" sound and the "d" sound. This phrase means that something has deteriorated, spoiled, or gone rotten. It is commonly used to describe food or perishable items that have expired or are no longer safe to consume.
The term "go bad" refers to the state or process in which something deteriorates, spoils, or becomes inedible or unfit for use. It can be used to describe a variety of situations and objects, ranging from food and perishable items to relationships, plans, or circumstances.
In the context of food, "go bad" implies that it has decayed or decomposed due to various factors such as exposure to air, moisture, heat, or bacteria. This often results in changes in color, texture, taste, or smell, rendering the food unsafe or unpalatable for consumption. Similarly, perishable goods or items with expiry dates can "go bad" when stored improperly or for an extended period past their recommended shelf life, becoming ineffective or potentially harmful.
Beyond the realm of food, the phrase can also be used to describe the deterioration of non-tangible things. For example, friendships or relationships can "go bad" when trust is broken, conflicts arise, or communication breaks down, leading to negative emotions and potential separations. Likewise, plans or situations can "go bad" when unexpected obstacles or unfavorable circumstances arise, causing them to fail or become unfavorable.
Overall, the term "go bad" encompasses the concept of decay, spoilage, or deterioration, whether it pertains to food, perishable items, relationships, plans, or circumstances. Its usage suggests an undesirable or negative transformation that renders something unusable, unfit, or undesirable.
The phrase "go bad" is a compound of two English words: "go" and "bad". Each of these words has its own separate etymology.
1. "Go": This word has its roots in Old English, most likely from the West Germanic language group. In Old English, it was spelled as "gān" and meant "to go, walk, or depart". The word had similar forms in other Germanic languages. The exact origin of this word is uncertain, but it is believed to have evolved from an earlier Indo-European root meaning "to go" or "to walk".
2. "Bad": The word "bad" also comes from Old English, where it was spelled as "bǣd". It meant "inferior in quality, defective, evil, or wicked". Old English borrowed this word from the West Germanic language group as well.
