ENDEAVOUR - [verb; noun] to try to do something; an effort to do something
Examples of use
You must endeavour to get a promotion and earn more money.
His endeavour to make a good impression on her was futile. She married another man.
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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