TO ENCOUNTER - [verb] to meet something difficult or dangerous; to meet somebody unexpectedly
Examples of use
The great knight encountered a poisonous snake on his way home.
He encountered his old friend from the university at the hotel.
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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