Correct spelling for the English word "feast up on" is [fˈiːst ˌʌp ˈɒn], [fˈiːst ˌʌp ˈɒn], [f_ˈiː_s_t ˌʌ_p ˈɒ_n] (IPA phonetic alphabet).
"Feast up on" is an idiomatic expression that is derived from the verb "feast" combined with the preposition "up on." This phrase typically signifies indulging or consuming a large quantity or variety of food in a celebratory or enthusiastic manner, often with a sense of enjoyment or satisfaction.
To "feast" originally refers to the act of consuming a plentiful meal or festive meal with sumptuous food and drink to mark a special occasion. It suggests a sense of abundance, opulence, and sometimes ritualistic or ceremonial nature. Adding the preposition "up on" emphasizes the act of thoroughly consuming or partaking in a particular kind of food, meal, or gathering.
When one "feasts up on" something, it implies relishing in a feast-like manner and making the most of the occasion. This could involve savoring and enjoying a wide range of cuisines, dishes, or delicacies, potentially overindulging or luxuriating in the abundance of food that is available. The phrase can be used to describe a person's behavior during a large and elaborate meal, celebration, or feast, where they are enthusiastically consuming and taking pleasure in the culinary offerings.
Overall, "feast up on" implies a joyful and often extravagant act of eating or celebrating with an ample supply of food, typically associated with special occasions or festive gatherings.