INTEREST RATE - [noun] a price that you pay for using money that you borrow from a bank
Examples of use
High interest rates discourage people from taking loans.
The best advertisement for a bank is to offer low interest rates.
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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