The word "doest into" is not a correct spelling in modern English. However, it may refer to the archaic form of the verb "do" in the second person singular, used in Shakespearean language and older texts. The correct spelling in this context is "doest", with the stress on the first syllable /ˈduːɪst/. The "into" is not a part of the verb "doest" but a preposition meaning "to the inside of". Therefore, the correct phrase would be "doest in" /ˈduːɪst ɪn/.
The phrase "doest into" is not commonly used in contemporary English. However, when broken down, we can explore the etymology of its components.
1. "Doest": This is the archaic second-person singular form of the verb "do" in the present tense. In modern English, it is used as "do" for the second-person singular pronoun "thou" (e.g., "thou dost"), but this form has largely fallen out of use.
2. "Into": This preposition dates back to Old English and its Old English form was "intō". It is derived from the combination of two elements: "in" (meaning "in" or "into") and "to" (used to express location or direction). "Into" indicates movement or a change in position towards the inside or interior of something.