The correct spelling of the phrase "alights up on" is actually "alights upon." The confusion might arise because the two phrases have similar sounds, but the correct spelling is important in conveying the intended meaning. The word "alight" means to settle or land upon something, whereas "alight up on" would suggest going up in flames. The IPA phonetic transcription for "alight upon" is /əˈlaɪt əˈpɒn/, with the stress on the second syllable of both words.
"Alights upon" is a phrase that generally refers to the action of landing or settling on something, typically to describe the movements of birds, insects, or other flying creatures. When an object or organism "alights upon" something, it means that it has come to rest or perch on it momentarily or temporarily. The phrase can also be used metaphorically to describe the way a person's attention or focus is directed towards something.
The term "alights upon" can be viewed as a combination of the verb "to alight," meaning to descend or settle, often associated with birds or insects finding a place to rest momentarily, and the preposition "upon," which denotes the relationship between two objects, indicating that one has come into contact with or is resting on another. The phrase suggests a sense of fleetingness, transience, or pause in movement.
The metaphorical use of "alights upon" is often employed in descriptive or figurative contexts to depict a fleeting encounter, moment of inspiration, or when someone's attention is temporarily captured by something unexpected or noteworthy. For example, one could say, "His eyes alighted upon her beauty," emphasizing how their attention was momentarily captivated by her appearance. Similarly, it can describe how a bird or butterfly alights upon a flower, pausing briefly to gather nectar or rest before continuing its flight.