English Idioms About “Relationship”
Idiom: Play second fiddle
Meaning: To take a subordinate or weaker position than someone else.
Example: Bill doesn’t want to play second fiddle to his colleague any more. He feels he is more trained and more experienced.

English Idioms About “Parts of the body”
Idiom: Keep a civil tongue
Meaning: (Also keep a civil tongue in one’s head) to speak politely.
Example: Please don’t talk like that to each other. Keep a civil tongue!