Japanese · Pronunciation Guide
o-ki-ru, three even beats — a short pure o, a light k, and one tap at the end.
okiru
The peak lands on ki, though every slot is measured the same. It contrasts usefully with 置く (oku), which is only two beats: same opening vowel, same k, but a different verb class and a different rhythm. Keeping them distinct in length is what keeps them distinct as words.
Listen: 起きる
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今日は早く起きました。
Kyou wa hayaku okimashita.
I got up early today.
Listen: 今日は早く起きました。
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今日は早く起きました pairs the past form 起きました with 早く (ha-ya-ku), whose final u devoices before the following k. So the sentence has a whispered mora immediately before a fully voiced one — a clean demonstration that devoicing is triggered by the neighbourhood, not by the vowel itself.
"oh-KEE-roo" carries all the standard faults: a glided first vowel, stress and length on the middle, an English r and rounded lips at the end. Level everything out. The i in particular gets over-lengthened because English "key" is long; halve it, and the three beats will start to sound genuinely equal.