In programming, we often use a metasyntactic variable called 'bar'.

This dress is a hand-me-down.

He is learning calligraphy with a writing brush.

This bus is full, there's no place to sit.

This bus is full.

When I looked out the window, it was snowing.

He puffed out a breath after climbing the long stairs.

After running up the stairs, he breathed heavily.

He is an expert in ethology, and his research is highly regarded worldwide.

Allah sees everything.