acquainted with (someone or something)
1. Having met someone, but not knowing them well. I'm just acquainted with Daniel because we have many friends in common. Are you acquainted with my sister? I can't remember if you two met before.
2. Knowledgeable about or familiar with something. I need to become acquainted with the rules of this game. Dale is acquainted with the new procedure for data entry, so he will show it to you.
*acquainted with someone
[of a person] known to someone; [of a person] having been introduced to someone. (*Typically: be ~; become ~; get ~.) We are only acquainted with each other. We are certainly not what you would call close friends.
*acquainted with something
familiar with something; able to understand or recognize something. (*Typically: be ~; become ~; get ~.) Tom is fully acquainted with the way we do things.