Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.

WORD ORIGIN

in the figurative sense, by 1970, American English, from whistle (as something sounded in an alert) + agent noun from blow (v.1). Earlier in U.S. sports slang sense "referee."

MORE RELATED WORDS FOR WHISTLEBLOWER

Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.