I stiffened my back and faced him.

我挺直了腰杆面对着他。

《牛津词典》

I stiffened my body and put my left foot out again, for the third time.

身体再次把自己的左脚伸了出去，第三次伸了出去。

youdao

How different had this scene looked when I viewed it laid out beneath the iron sky of winter, stiffened in frost, shrouded with snow!

这景色与我在冬日铁灰色的苍穹下，冰霜封冻、积雪覆盖时看到的情景多么不同呀！

youdao

I stiffened at the sound of her hoarse whisper.

VOA: special.2009.02.14

"I just stiffened up in the groin and hamstring, I'm glad it's nothing more, " Ledley told BBC Sport Wales.

BBC: Kevin Ratcliffe backs Cardiff City's play-off hopes

Angel ran around like a maniac as soon as I arrived, probably because his mother visibly stiffened at my presence.

NEWYORKER: Swimming

She stiffened and moved away from me, but I turned up the music and we settled back to drive and watch the moon come up.

CNN: Doomed Love At The Taco Stand