The boxer is ready to call time on his long career.
(call time means end)
The project failed, we're back to square one.
(back to square one means back to the start)
（back to square one 指从头再来）
The restaurant is open around the clock.
(around the clock means at all times)
（around the clock指连续一整天）
The sales manager was at death's door after his heart attack.
(at death's door means very near death)
（at death's door指生命危在旦夕）
Wait until you try the new Yamaha scooters. They'll knock your socks off!
(knock your socks off means amaze you)
（knock your socks off指让人震惊的）