Я болею за их команду.

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Breakdown of Я болею за их команду.

• команда: the team
• их: their
• болеть за: to support

Questions & Answers about Я болею за их команду.

In other contexts болею means “I am ill”. Why does it mean “I support” here?

Russian болеть has two common meanings:

1. To be ill / to have a disease

   • Pattern: болеть чем?
     
     • Я болею гриппом. – I have the flu.

2. To root for / to be a fan of someone or a team

   • Pattern: болеть за кого? / за что?
     
     • Я болею за их команду. – I support their team.

So the preposition за after болею tells you this is the “root for, cheer for” meaning, not the “be ill” meaning. Context and the construction болеть за are the key.

What is the infinitive and full conjugation of болею?