On Facebook, you can create a group. You can further 'classify' the group wherein there's an option - 'closed'. When you create a group, the description for that group is shown as 'Closed group'.
Now there's a catch. If someone sees this group and reads 'Closed group', it may mean that the group is 'closed' and no more requests for joining the group is allowed. So, here, 'closed' is opposite to 'open'.
While writing a post on social media, I was stuck due to this ambiguity.
You can either join a closed group or can create one.
For a newbie, there's an obvious question - how can one join the group which is already closed! Blame past participle for this!
I think I can certainly use 'close' instead of 'closed' to avoid ambiguity.
You can either join a close group or ....