Japanese · Pronunciation Guide
a-u, two separate vowel beats with no consonant — and definitely not the "ow" of English "cow."
au
Two morae made entirely of vowels, which is precisely the configuration English cannot resist fusing. The accent falls on the first, so a is high and u drops, but the fall must not swallow the second beat. Two counts, two distinct vowel qualities, no diphthong anywhere.
Listen: 会う
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明日、友達に会います。
Ashita, tomodachi ni aimasu.
I am meeting a friend tomorrow.
Listen: 明日、友達に会います。
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明日、友達に会います conjugates it to 会います, four morae (a-i-ma-su) — and notice the base vowel changes from u to i, giving another vowel-plus-vowel sequence at the start. 明日 (a-shi-ta) opens the sentence with a devoicing-prone shi. So the line begins with a whisper and continues with vowels that must stay apart.
Everyone's first attempt is "ow" or "ah-oo" with rounded lips at the end. English builds a diphthong out of any two adjacent vowels, and rounds its back vowels automatically. Japanese does neither: keep the lips flat throughout, and give the u enough time to register as a separate beat rather than as the tail of the a.