at full stretch:using as much energy as possible, or the greatest possible amount of supplies 竭盡全力;以最大財力物力

Fire crews have been operating at full stretch. 各消防隊一直在全力以赴.

we've been working at full stretch for weeks to get the hall ready for the conference.
我們為了布置開會用的大廳奮力干了好幾個星期.

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

The wheel of fashion has come full circle. I was wearing shoes like that thirty years ago.
時尚兜了個圈子又回來了,我30年前就穿那樣的鞋子.