tail off

基本解释

Here, the number of active users starts to tail off, with a large drop over the summer months.
这时，活动用户的数量开始减少，在整个夏天的几个月有较大幅度的下降。
You spend all of this time working your tail off and yet you still find yourself in financial trouble.
你花掉了所有这些时间用于工作，却发现自己仍然有财务问题。
For example, wages tend to be high near densely occupied blocks, but tail off within a mile or two.
举例来说，在居民稠密街区的附近，工资往往较高，但一两英里以外，工资水平就降下来了。

Many shale plays flow vigorously for just a few weeks and then tail off dramatically.
FORBES: Energy XXI Coins Money Reworking Old Exxon Mobil Wells
Even if productivity growth does tail off, it may still be strong enough to match sluggish demand.
ECONOMIST: Productivity growth
If accepted, that might require the government to raise its fiscal target even as recovery starts to tail off.
ECONOMIST: The big fight over fiscal reform

When something tails off, it gradually becomes less in amount or value, often before coming to an end completely.