The word "boused" is a variant spelling of "boozed," meaning to drink alcohol to excess. The IPA phonetic transcription of "boused" is /baʊzd/ with the first syllable rhyming with "now." The "ou" in "boused" represents the diphthong /aʊ/, which sounds like the vowel sound in "how" or "cow." The final "ed" in "boused" indicates the past tense, and is pronounced like /d/ or /t/ depending on the preceding sound.
The word "boused" is derived from the Middle English word "bowse", which itself traces back to the Old Norse word "bausa". Both "bowse" and "bouse" were used to describe drinking alcohol, particularly in large quantities. Over time, "bouse" became more commonly associated with excessive drinking, leading to the modern English term "boused", which means to get drunk.