Pronunciation: [kˈiːd ˈɒn] (IPA) 
The phrase "keyed on" is spelled with the short e sound /ɛ/ in the first syllable of "keyed", followed by the diphthong /i/ /əd/ in the second syllable of "keyed on". This phrase typically means to focus or be fixated on something. It's important to remember the proper spelling and pronunciation of words, such as "keyed on", in order to effectively communicate and avoid confusion.
The term "keyed on" is a phrasal verb that combines the verb "key" with the preposition "on." It is used to describe a situation where someone or something is focused intensely on a particular thing, idea, or aspect. "Keyed on" is often used to convey the notion of concentration, emphasis, or priority regarding a specific target or objective.
When a person is "keyed on" something, it implies that their attention and efforts are fixated on that particular subject matter. This could include actively pursuing a goal, prioritizing a task, or devoting significant resources towards a specific area. The phrase suggests a strong interest or dedication to achieving a desired outcome.
Similarly, "keyed on" can also be used to describe an object or mechanism that is specifically designed or adjusted to respond or react to a particular input. In this sense, the term suggests that a device or system is finely calibrated or attuned to focus on a specific set of parameters. For example, a car's ignition system might be "keyed on" a unique key shape to ensure that only the correct key can start the vehicle.
In summary, "keyed on" describes a state of focus or emphasis on a particular objective or subject, either in terms of human attention and effort or within the context of a specialized mechanism.
The phrase "keyed on" does not have a specific etymology because it is a combination of two separate words: "key" and "on".
The word "key" can be traced back to the Middle English word "keye" and the Old English word "cǣg" which meant "metal instrument for opening locks". It ultimately derives from the Latin word "clavem", meaning "key" or "bolt".
The word "on" originated from the Old English word "on" or "an", which denoted various prepositional uses including "in", "into", or "on". It has remained relatively unchanged in terms of its core meaning throughout history.
When "keyed" and "on" are combined, they form the phrase "keyed on", which means to focus on or pay attention to something specific.
