His hand moved to his mouth as he tried to damp down the panic.
他用手捂住了嘴，试图使惊恐的情绪平静下来。
《柯林斯英汉双解大词典》
2
She smacked her handdown on to the table.
她啪地一拍桌子。
《牛津词典》
3
For instance, if a car driver slows downto let you cross the road, simply raising your hand in acknowledgement is enough to show that you appreciate the driver's consideration.