quietened

v.

（使）安静( quieten的过去式和过去分词 )；（使）平静；（使）平息；（使）（感情）减轻

1. She tried to quieten herself down.
   她试图使自己镇静下来。
2. You must quieten down when the teacher comes into the classroom.
   老师来到教室时你们必须安静下来。

On the prediction of impact noise, X: The design and testing of a quietened drop hammer
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A doubt that has at last been quietened
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Talk of an End to the Misery Has Quietened
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Would taming the T-cell quieten the eye?
Quiet Your Mind: How to Quieten Upsetting Thoughts and Regain Inner Harmony
Train troubles quieten Coulter