Japanese · Pronunciation Guide
ko-ko, two identical short beats — same consonant, same vowel, same length.
koko
A word built from the same mora twice is a perfect diagnostic. Both beats are the same size, and the melody rises across them without falling back. If one half sounds stronger, longer, or clearer than the other, that's English reducing an unstressed syllable.
Listen: ここ
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ここに来てください。
Koko ni kite kudasai.
Come here.
Listen: ここに来てください。
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ここに来てください pairs it with 来て (ki-te), where the ki between voiceless sounds tends to devoice. So you get two fully-voiced identical beats, then a whispered one, then ください's four. The sentence is a small survey of how much voicing varies while timing does not.
The reflex is "KOH-koh" with English stress on the first beat and diphthongs on both o's. Neither vowel moves in Japanese, and neither beat outranks the other. Say it flatter and shorter than feels natural — the word should sound almost mechanical, which is exactly right.