quietens , quietening , quietened
If someone or something quietens or if you quieten them, they become less noisy, less active, or silent.
The wind dropped and the sea quietened.
风势减弱了,大海平静下来。
To quieten fears or complaints means to persuade people that there is no good reason for them.
Supporters of the constitution had to quieten fears that aristocrats plotted to steal the fruits of the revolution.
宪法的支持者们必须消除人们对贵族阴谋窃取革命成果的恐惧。