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What does the word "Idiom" mean?

Idioms are a fixed combination of words (expressions) whose meaning is different from the meaning of the individual words.
For example:
miss the boat which means to miss the opportunity or the chance.

Who can tell me the number of the English lettes?
من يستطيع ان يخبرني بعدد حروف اللغة الإنجليزية

Good morning my dear friends
I'm baaaack