traitor

 
Pronunciation: /ˈtreɪtə/

noun

  • a person who betrays someone or something, such as a friend, cause, or principle: he was a traitor to his own class

Phrases

turn traitor

betray a group or person: she’d had the gall to deny she had turned traitor

Origin:

Middle English: from Old French traitour, from Latin traditor, from tradere 'hand over'

Spelling help

Remember that traitor ends with -or.