a situation in which somebody tries to force somebody else to give them money using violence, threats, etc. 勒索;敲诈 a complete and careful search of somebody/something 彻底搜查 a police shakedown of the area 警方对这一地区的彻底搜查
a test of a vehicle to see if there are any problems before it is used (交通工具的)试用,试航,试飞