Leo: Okay, do you want my advice or don't you?
Paige: Depends on whose side you're on. And if you take hers, it better not be because you're sleeping with her.
What does "it better not be" here mean? I think this sentence omits something.
In full, "it had better not be because you're sleeping with her". The omission of "had" may occur in casual English. "had better not be" is a way of expressing a strong desire that something is untrue, often with a nuance of threat that something bad will happen if it is true.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.
In full, "it had better not be because you're sleeping with her". The omission of "had" may occur in casual English.
"had better not be" is a way of expressing a strong desire that something is untrue, often with a nuance of threat that something bad will happen if it is true.