quieten
v[I, Ip, Tn, Tn.p]
~ (sb/sth) (down) (esp Brit) (cause sb/sth to) become less disturbed, noisy, etc (使某人[某事物])平静些, 安静些
Quieten down and get on with your work. 静下心来继续工作吧.
quieten a screaming baby 哄著惊叫的小孩儿
quieten (ie allay, calm) sb's fears/suspicions 消除某人的恐惧[怀疑].