What's the appropriate term to describe the end of classes in school at the end of the day everyday (to resume again the very next day). Can we call it school break or disassembly or is there a specific term to describe it?
- The end of the day,
- The end of the school day,
or maybe (in spoken American English)
- “the end of last period today.”
are all fine.
- Dismissal, or
- Dismissal today
would be the formal term in American usage.
School break refers to the holidays between terms, like winter break, winter vacation, spring break or summer break.
“Assembly” and “Disassembly”
A quick note: “Assembly” doesn’t mean the start of the school day, it means a formal (or mandatory) gathering, like this:
- user Mailer_Diablo at wikimedia
Disassembly refers to taking apart machines, not groups of people. This is even though “assembly” can mean a group of people assembled together, especially at a school.
The time at which school or work finishes and one goes home.
‘The bell rang for home time’
It's true that definition includes ...or work [finishes], but I at least think it's essentially a childish usage. In the "grown-up" world of work, we use a different (slightly "slangy") alternative to avoid that association...
The time when you finish work.
'Come on, then. It's knocking-off time'.
(Note that the above are both primarily British English usages.)