Cut (someone) down to size
To prove that someone is not as good as he or she thinks. I cut my colleague down to size when I criticized what he said at the meeting.
Relationship Idioms
Confide in (someone)
To tell secrets or personal information to someone. I usually confide in my friend when I have a problem.
Come between (two people)
To disrupt the relationship between (two people). The mother's constant interfering finally came between the man and his wife.
Cozy up to (someone)
To try to be extra friendly to someone. I do not know what my neighbor wants but recently he has been trying to cozy up to me.