Question

what is defection???

Answer 1

Defection. ... In politics, a defector is a person who gives up allegiance to one state in exchange for allegiance to another, in a way which is considered illegitimate by the first state. More broadly, it involves abandoning a person, cause, or doctrine to which one is bound by some tie, as of allegiance or duty. 

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Answer 2

hey here is ur answer.
The term is applied, often to anyone who switches loyalty to another religion, sports team, political party, or other rival faction. In that sense, the defector is often considered a traitor by original side.
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