Pronunciation: [hˈadəst wˈɒnz nˈʌmbə] (IPA) 
In Old English, the verb "to have" had multiple forms. "Haddest" is the second person singular form of "have" in the present tense. "One's number" means that someone has been discovered or figured out, as in "I have your number." Therefore, "haddest one's number" means that you have someone figured out. The IPA transcription for "haddest ones number" is /ˈhædɛst wʌnz ˈnʌmbər/.
The phrase "haddest one's number" is an idiomatic expression that is usually used in informal speech. It refers to having a thorough understanding of someone's character, motives, or true intentions. It implies the ability to predict someone's behavior accurately, often suggesting a level of familiarity or intuition beyond what is typically attainable.
The word "haddest" here is an archaic form of the verb "to have" in the second person singular past tense, used to indicate possession. "Number," in this context, is a metaphorical term representing the individual being referred to. It symbolizes the unique traits, inclinations, or patterns of behavior that distinguish that person.
When someone says they "haddest one's number," they are claiming to know and comprehend the inner workings of that person's personality, motivations, or mindset. It implies a deeper level of insight, acquired through observation, experience, or an intuitive understanding of human behavior.
This expression may relate to being able to anticipate someone's actions or reactions accurately and predict their behavior accordingly, potentially giving the speaker an advantage in interpersonal relationships or dealings. However, it is essential to note that this phrase is largely colloquial and not commonly found in formal or professional contexts.
