What does it mean that someone is "basically engaged"? Sounds like a cool out so they don't get asked about it again?

So my brother-in-law has been dating his girlfriend for a while like 11 years and apparently recently they "basically got engaged" and I'm guessing both of them felt pressured because my husband and me recently got married and well I assume that now he's doing it out of convenience but the thing is that my husband's family does not like this chick so I don't know how my in-law family is going to react once they find out I mean that's if it's that they are actually engaged but I feel like he's just doing it out of convenience just so she shuts up and I say that because he on multiple occasions has said that he does not believe in marriage and thinks it's stupid to get married like a waste of time and money knowing that his girl wants to get married
What does it mean that someone is "basically engaged"? Sounds like a cool out so they don't get asked about it again?
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