[countable] a device for controlling the flow of liquid or gas from a pipe or container
龙头；阀门◆a gas tap
天然气阀门◆(figurative) At first they had many investors, but now the money tap has been turned off.
起初他们拥有很多投资者，但现在资金来源已被切断。 ●on ˈtap (informal)

1. available to be used at any time
   随时可以使用的◆The new software means that we have the latest sales figures on tap.
   有了这款新软件，我们可以随时获得最新的销售数据。