GUARD - [noun] somebody or a group of people that watches over somebody or something
Examples of use
We all went to watch the changing of the guard of the Buckingham Palace.
The murderer was brought to the prison under a numerous guard.
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English speaking practise
Remember that if you don't use that word in English conversations or writing you'll forget it in a short time. So the best thing you can do to learn this word is just trying to use it in speaking or writing. Remember also that practise is the key to fluent english speaking.
You can always find a partner, who would also like to improve his/her