Today’s useful phrase is about people.
You’ll sometimes hear others say that someone is a bad apple.
This means that the person is a bad influence.
Parents will often say or think this phrase about their children’s friends.
Examples:
Mother: I don’t like my son’s friend, Tommy.
He’s a bad apple.
Teacher: That girl is a bad apple.
I’m worried about her future.
Father: I don’t want you hanging out with Mike.
He’s a bad apple.
●日本語訳：ひとつの腐ったリンゴが他のリンゴもダメにするというのが直訳になり、
『ひとり、または少人数が集団に対して悪影響を及ぼす』という意味で
使います。