Correct spelling for the English word "becum" is [bɪkˈʌm], [bɪkˈʌm], [b_ɪ_k_ˈʌ_m] (IPA phonetic alphabet).
The word "become" has Old English origins and can be traced back to the word "becuman". It is derived from the combination of two elements - "be-" (meaning "to be, to exist") and "cuman" (meaning "to come"). In Old English, "becuman" meant "to come to, to reach, to arrive", and eventually evolved to encompass the meaning of transition or transformation, as in "to come to be" or "to turn into". Over time, it morphed into the modern English word "become", which still carries the sense of undergoing a change or developing into something.