double major
US /ˌdʌb.əl ˈmeɪ.dʒər/
UK /ˌdʌb.əl ˈmeɪ.dʒər/

1.
a student who pursues two different academic majors simultaneously, or the two fields of study themselves
:
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She decided to double major in computer science and mathematics.
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Many students choose to double major to broaden their career options.
1.
to pursue two different academic majors simultaneously
:
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She plans to double major in economics and political science.
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It can be challenging to double major, but it offers more opportunities.