Pronunciation: [dˈə͡ʊst ɪt] (IPA) 
The correct spelling of the phrase is "doth it," not "doest it." "Doth" is an archaic third person singular present tense form of the verb "do" commonly used in Shakespearean literature. In IPA phonetic transcription, "doth it" is transcribed as /dɒθ ɪt/, with the "th" sound being produced by placing the tongue between the upper and lower teeth or on the alveolar ridge while exhaling air through the mouth.
"Doest it" is an archaic form of the phrase "do it," primarily used in Early Modern English and commonly associated with Shakespearean or biblical language. This phrase consists of two words: "doest," derived from the verb "do," and "it," a pronoun referring to an object or action. It is imperative in nature, often conveying a command or instruction.
The term "doest" is the second-person singular form of the verb "do" in the present tense indicative mood. It is conjugated specifically for the pronoun "thou," which was used to address a single individual informally. "Doest" functions as an auxiliary verb to express actions, tasks, or obligations that an individual should undertake or perform. It can refer to both physical and mental actions, encompassing a wide range of activities.
The addition of "it" in the phrase "doest it" establishes a clearer object or action for the command. "It" can stand for various nouns or verbs, clarifying the specific task or duty being addressed. This phrase, therefore, signifies an instruction given to another person, urging them to fulfil a particular action or obligation promptly.
While "doest it" is no longer commonly used in contemporary English, understanding its historical usage helps in interpreting literary works from the Early Modern period, as well as religious texts such as the Bible.
The phrase "doest it" is a conjugation of the verb "do" in the second person singular form, present tense, in Early Modern English.
The word "do" has Old English origins, deriving from the Proto-Germanic word "dōnan", meaning "to put, to place". In Middle English, it evolved into "don", which was used as an auxiliary verb, and by the Early Modern English period, it transitioned to "do".
The suffix "-est" denotes the second person singular form in Early Modern English, indicating that the action is being performed by "you".
Overall, the etymology of "doest it" can be traced back to Old English and the evolution of the word "do" throughout the history of the English language.
