Word: 伸腰 (shēnyāo)

坐了一下午，他站起来伸了伸腰。

Zuòle yí xiàwǔ, tā zhàn qǐlai shēnle shēnyāo.

After sitting all afternoon, he stood up and stretched his back.

罐子里的豆芽儿，休想伸腰

guànzi lǐ de dòuyár, xiūxiǎng shēnyāo

bean sprouts in a jar: don't expect to stretch your back

老猫睡在火炉旁,不是伸腰就是打哈欠

lǎo māo shuì zài huǒlú páng,bú shì shēnyāo jiùshì dǎhāqian

an old cat sleeping by the stove: either stretching or yawning