SUBORDINATE - [noun] a person with a less important position at work than you
Examples of use
The boss always gives the routine paper work to his subordinates.
Subordinates are often treated badly by their superiors.
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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