A sinew is a strong tissue in the body that connects muscles to bones.
Sinew is about strength and power in the body.
Examples:
The sinew in his leg helped him run fast.
She tore the sinew in her arm and it hurt.
The sinew in my back is very strong.
I think my sinew is stronger than yours!
The sinew in an elephant is very, very strong.
The lion's sinew helped it catch the deer.