The spelling of the word 'drubs in to' may seem unusual to those who are not familiar with it. However, when broken down phonetically using the IPA (International Phonetic Alphabet), it becomes clearer. The 'drub' sound itself is represented by the phonetic transcription /drʌb/. The subsequent 's' sound is represented by /s/ and the 'in to' is represented by /ˈɪntə/, indicating a contraction of 'in' and 'to'. Therefore, the correct spelling is 'drubs into', representing the action of striking or beating repetitively.