LEAF - [noun] one of the parts of a tree that is joined to its branch and falls in autumn
Examples of use
The winter is over and the trees are in leaf again.
I love going for walks in autumn, when the colourful leaves are everywhere.
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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