The appellant is the party who, having lost part or all their claim in a lower court decision, is appealing to a higher court to have their case reconsidered.
ðɪ ɐpˈɛlənt ɪz ðə pˈɑːɹɾi hˈuː, hˌævɪŋ lˈɔst pˈɑːɹt ɔːɹ ˈɔːl ðɛɹ klˈeɪm ɪn ɐ lˈoʊɚ kˈoːɹt dᵻsˈɪʒən, ɪz ɐpˈiːlɪŋ tʊ ɐ hˈaɪɚ kˈoːɹt tə hæv ðɛɹ kˈeɪs ɹˌiːkənsˈɪdɚd.