TO SUBMERGE - [verb] to go or make something go under the surface of water; to give all your time and attention to something
Examples of use
The submarine submerged and then rose to the surface again.
She gave up college and submerged herself in acting.
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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