TO WHISPER - [verb] to speak very quietly, so that only a person that stands near you can hear
Examples of use
The girls in the restaurant were whispering in the corner. I'm sure they were telling gossips.
He whispered in her ear "I love you" and gave her a kiss.
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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