vt.

1. 把……弄直；使挺直
   He straightened the bent strip.

   他把那弯曲的金属片弄直了。

2. 整顿，清理；澄清[（+out/up）]
   Let's straighten up the room.

   我们把房间整理一下吧。

3. 使改正；使好转[（+out）]

vi.

1. 变直；挺起来[（+up）]
   As she straightened up, the ache in her back grew worse.

   她直起身子时，背部的疼痛更厉害了。

2. 改正；好转[（+out/up）]
   Things will straighten out.

   情况会好转的。

v.

1. make or become straight.
   ▸stand or sit erect after bending.
2. (straighten up) (of a vehicle, ship, or aircraft) stop turning and move in a straight line.