This is the 112th most frequent Arabic word.
حين
"حين" means "time" or "period" in English.
The word "حين" is used to denote 'when' in a temporal clause, indicating the time someone finishes their work.
سأزورك حين تفرغ من عملك.
I will visit you when you finish your work.
Here, "حين" takes the meaning of 'time' within an expression that means 'at all times' or 'always'.
يجب أن تكون مستعدًا في كل حين.
You should be ready at all times.
In this sentence, "حين" is used to mean 'while,' indicating simultaneous actions or events.