at full stretch:using as much energy as possible, or the greatest possible amount of supplies 竭尽全力;以最大财力物力

Fire crews have been operating at full stretch. 各消防队一直在全力以赴.

we've been working at full stretch for weeks to get the hall ready for the conference.
我们为了布置开会用的大厅奋力干了好几个星期.

come, go, etc. full circle:to return to the situation in which you started, after a series of events or experiences (事情或经历)兜了一圈回到原处,回到原点

The wheel of fashion has come full circle. I was wearing shoes like that thirty years ago.
时尚兜了个圈子又回来了,我30年前就穿那样的鞋子.