The phrase "keys up" is commonly misspelled as "keysed up." The correct spelling, with separate words, is due to the pronunciation of the phrase. The "s" sound in "keysed" does not match the actual sound of the word. In phonetic transcription, "keys up" would be written as /kiːz ʌp/. The "z" sound represents the phoneme /z/ that occurs between the "s" sound in "keys" and the "uh" sound in "up," emphasizing the distinction between the two words.
"Keys up" is an idiomatic expression that can be used both as a verb phrase and an adjective phrase. As a verb phrase, it is often used informally to describe the act of becoming excited, excitedly anticipating, or eagerly preparing for a particular event or situation. It usually involves a heightened state of energy, enthusiasm, or anticipation. When someone is "keyed up," they may experience heightened emotions, restlessness, or nervousness, typically in anticipation of something important or exciting.
As an adjective phrase, "keys up" may describe a person or a situation that is characterized by high levels of energy, excitement, or emotional intensity. For example, a group of fans waiting in line outside a concert might be described as "keys up" due to their eager anticipation of the upcoming performance.
The phrase "keys up" can also be used colloquially to describe the act of intensifying or escalating a situation or event, often in a negative sense. It may imply provoking someone or something into a heightened or more agitated state.
Overall, "keys up" denotes a state of heightened excitement, anticipation, or energy, either in a positive or negative context, depending on the situation and the way it is used.
The phrase "keys up" does not have a specific etymology. It appears to be a combination of the word "keys" and the adverb "up", where "keys" possibly refers to the piano keys or any keys on a keyboard instrument (not to be confused with actual keys like those used to unlock doors). "Keys up" is used in contexts related to playing the piano or keyboard instruments, where it usually means to press or strike the keys with energy, speed, or intensity. It is also sometimes used metaphorically to describe someone feeling excited or agitated.