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English definition of “back”

back

adjective [before noun]     /bæk/
back pay/rent/tax, etc. pay , rent , tax , etc. that should have been paid or was expected at an earlier time : Most of the back taxes due were for the years 2006 through 2008.
on the back burner If something is on the back burner , it is not being dealt with at the present time , especially because it is not urgent or important , but it will be dealt with in the future : Any plans of opening new restaurants are on the back burner until the recession ends . I lost my job and had to put my plans to move house on the back burner .
take a back seat to become less important (than something else ): Agriculture , which generates only about $50 million a year in revenue , takes a back seat to other industries like oil and gas that bring in billions of dollars . Environmental issues take a back seat in tough economic times . to let other people have a more active and responsible position than you in an organization or activity : After appointing a new chief executive , the chairman of the fashion chain is finally taking a back seat at the business he founded .
(Definition of back adjective from the Cambridge Business English Dictionary © Cambridge University Press)
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