Calf (noun)

1. The young of domestic cattle.
2. The fleshy back part of the lower leg between the ankle and the knee.
3. A young or immature person or animal.

Origin:

The word "calf" comes from the old english word "cealf" which refers to a young cow or bull. it has been in use since the 8th century.

Examples:

1. The farmer was bottle-feeding a calf.
2. I strained my calf muscle while running.
3. She was such a calf, she didn't know how to tie her shoelaces.
4. The baby elephant was wobbly on its new calf legs.
5. The calf was the only survivor of the herd.