It comes from the Latin murus (wall).

Excuse me while my claustrophobic self curls up in a corner and twitches uncontrollably.   

1 minute ago, Valkyrie said:

Excuse me while my claustrophobic self curls up in a corner and twitches uncontrollably.   

It's the last brick that really gets you.

Just now, drpaladin said:

It's the last brick that really gets you.

Thanks for that    

10 minutes ago, Valkyrie said:

Thanks for that    

 

Thankfully, I'm l not claustrophobic. I'm laying here  now totally shrouded under a blanket.

10 minutes ago, drpaladin said:

Thankfully, I'm l not claustrophobic. I'm laying here  now totally shrouded under a blanket.

 I like being shrouded in blankets, as long as I can stick my feet out of them lol

38 minutes ago, Bill W said:

So, does demure mean a modest person is hiding behind walls??? 

One might imagine so, but the origin of demure isn't clear.