be with
To be someone's boyfriend/girlfriend, to understand what someone is saying, or to agree with them.
Meanings
To be in a romantic relationship with someone.
"How long have you been with your partner?"
To understand or follow what someone is saying.
"I lost you at the third step — are you able to go back? I'm not with you."
To support or agree with someone's position or idea.
"I'm completely with you on the need for more funding for public transport."
Very common in everyday speech. 'Are you with me?' means 'do you understand?' in informal conversation. 'I'm with you on this' means 'I agree with you'. The romantic sense is more informal than 'be in a relationship with'.
Commonly used with
Forms
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