TO INSERT - [verb] to put something inside something else
Examples of use
The light went out and I had difficulties to insert the key in the lock.
She inserted the letter between the books hoping that her husband won't find it.
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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