TO WOLF-WHISTLE - [verb] to whistle approvingly at a female
Examples of use
The road worker who had wolf-whistled at Peter's girlfriend was beaten up yesterday. No wonder, Peter's a boxer and he's extremely jealous of her.
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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.
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