The apple of someone´s eye; apples and oranges; arguing for the sake of arguing, etc [American Idioms]

The apple of someone´s eye

1. Someone favourite person or thing
2. A boyfriend or a girlfriend

• Tom is the apple of Mary´s eye. She thinks he´s great
• John´s new stereo is the apple of his eye

Apples and oranges

1. A pair of people or things representing two entities that are not similar.

• You can´t  talk about Tony and Fred in the same breath! They´re apples oranges
• Talking about her current book and her previous best-seller is like comparing apples and oranges

 Arguing for the sake of arguing and arguing for the sake of argument

1. Simply arguing to be difficult or contrary

• You are just arguing for the sake of arguing. You don´t even know what the issue is
• He is annoying, because he is always arguing for the sake of argument

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