Shorthand phrases

There are a few shorthand phrases that people round here use. I don't know if they're universal in the US, or local usages. I'd be interested to find out - if anyone wants to enlighten me. When you're new and haven't learnt the local lingo, they sound very bizarre.

1) You hear about people 'holding' children. This is short-hand for 'holding back from starting school in the academic year in which they would be entitled to do so'. If you feel your summer-birthday child isn't ready for Kindergarten, you can start them a year later. How many British parents would love that flexibility! Until you understand the short-hand, and unless the context helps you, this does make for some puzzling conversations. You might hear a mother say "We decided to hold Esmerelda because that seemed right for her. We didn't hold Grizelda though. She was a different case. No way would we have held her." It sounds very cruel and cold-blooded doesn't it? Those poor children, denied their parents' physical affection...

2) People talk about 'walking'. This took me a while to figure out. A friend was talking about a teacher at school, and said "she must be about the same age as my sister, because I remember they walked together". I assumed this was an exercise regime. But then I had a conversation a few weeks' later with a student who was telling me "I'm hoping to walk in the summer, but if I can't fit it all in, then I'll have to walk at Christmas". To walk means to graduate - from the graduation ceremony, I assume.

3) The YMCA here is almost always referred to as 'the Y'. You're probably wondering why on earth it comes up in my conversations at all. Well, the Y operates for most people very much as a council leisure or sports centre does in the UK. Everyone uses it for swimming, gym facilities, exercise classes, sports, and children's activities (gymnastics, dance, swimming, team sports). So it is very much a part of daily life, and it's always called 'the Y'. I heard on the radio this summer that the national organisation has decided to change its name officially from the YMCA to The Y. They can't do that! What about the song?

In return, here's an English usage which must sound very odd to American ears, until they get used to it. I've had to stop myself, whenever I've been going to say it. How bizarre it would sound to local people here if I asked them "what date does school break up?" It would be even more bizarre if I asked (as would be perfectly normal in the UK) "when are your kids breaking up?" It conjures a disturbing visual image. Perhaps it's the children who weren't held who break up.