whistle-blower
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whis·tle–blow·er

noun \-ˌblō-ər\

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

1970

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