Japanese · Pronunciation Guide
shi-me-ru, three even beats — a thin hiss, a flat "meh," and a single tap.
shimeru
High on shi, then down — and no slot longer than another. Like 開ける, this transitive verb has an intransitive partner — 閉まる (shimaru) — with the same number of beats but a different middle vowel, so precision in the vowels matters more than usual for being understood.
Listen: 閉める
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ドアを閉めてください。
Doa o shimete kudasai.
Please close the door.
Listen: ドアを閉めてください。
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ドアを閉めてください uses the te-form and again runs straight into ください without a break. ドア at the head is two morae (do-a) with two separate vowels — English "door" is one syllable, so the loanword is immediately longer in Japanese, and the a must be audible as its own beat.
"shee-MAY-roo" is the standard mispronunciation: a long first vowel, a diphthongised stressed middle, and an English r. Shorten the i, freeze the e, tap once for the r, and keep the lips flat at the end. The hiss should also be gentler than English sh — think of blowing across the top of a bottle rather than a full "shh."