1.   But at that time, biologists also saw sick, disoriented manatees acting strangely by curling their lips and arching their backs.

2.   The dog arched its back and showed its teeth.

3.   The dog arched its back.

4.   Then she leant backwards so that her back was arched across my chest.

5.   Try to keep your body upright, but slightly tilting forward so you do not arch your back.

6.   The cat arched its back and hissed.

7.   She arched her back and stretched herself.

8.   The cat arched its back.

9.   He spread his arms and he arched his back and he thrust his head as high into the sky as it would go.

10.   She threw back her head, arching her back, straining her body even closer against him.