noun \-ˌblō-ər\

: a person who tells police, reporters, etc., about something (such as a crime) that has been kept secret

Full Definition of WHISTLE-BLOWER

:  one who reveals something covert or who informs against another <pledges to protect whistle–blowers who fear reprisals — Wall Street Journal>
whis·tle–blow·ing \-ˌblō-iŋ\ noun

First Known Use of WHISTLE-BLOWER



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