Definition of “traitor” - English Dictionary

“traitor” in British English

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traitornoun [ C ]

uk /ˈtreɪ.tər/ us /ˈtreɪ.t̬ɚ/ disapproving

a person who is not loyal or stops being loyal to their own country, social class, beliefs, etc.:

The leaders of the rebellion were hanged as traitors.
The Chinese Communist Party branded (= called) Mr Gorbachev "a traitor to socialism".
traitorous
adjective uk /ˈtreɪ.tər.əs/ us /ˈtreɪ.t̬ɚ.əs/ formal disapproving

(Definition of “traitor” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“traitor” in American English

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traitornoun [ C ]

us /ˈtreɪ·t̬ər/

a person who gives away or sells secrets of his or her country, or someone who is not loyal to particular beliefs or friends:

Benedict Arnold was a traitor during the American Revolution.
Opponents called the mayor "a traitor to the cause."

(Definition of “traitor” from the Cambridge Academic Content Dictionary © Cambridge University Press)