noun
betrayer
noun
1
A person who betrays someone, or who gives away secrets to those who shouldn't have them; an informer.
"The film centers on a wartime betrayer who sold out his own resistance cell."
"History rarely remembers a betrayer kindly."
How to Use Betrayer
Learner’s notesIn plain EnglishSomeone who breaks trust by betraying another person.
Common pairings
a betrayer of trust
the ultimate betrayer
Word Forms
betrayers plural
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The film centers on a wartime _____ who sold out his own resistance cell.
Etymology
Simply betray plus the agent suffix -er, "one who does" — the same pattern as "teacher" from "teach."