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

So to speak, he is my friend.

Tefu is my best friend.

This dress is a hand-me-down.

He nodded in agreement as he listened to my story.

He was rowing a boat while singing a boating song.

He is still an inexperienced newcomer.

He is a newcomer and often makes mistakes due to his lack of experience.

His black coat was speckled with white, and it was very beautiful.

When you blanch broccoli, it becomes brightly colored.