From Longman Dictionary of Contemporary Englishsleuthsleuth /sluːθ/ noun [countable] old-fashioned FIND OUTsomeone who tries to find out information about a crime SYN detective —sleuthing noun [uncountable]
Examples from the Corpus
sleuth• By the same date the Recruit case sleuths should have completed their investigations.• But for once, the gentleman sleuth left home for the bright lights.• He has his sleuth say once that to commit a murder you need four aces.• What his sleuths seek are truths that everybody else knows already, or is afraid to know.• Few of us would consider the possibility that the information has been obtained through the services of a psychic sleuth.• After the accusation, they are worried-sick parents, small-town pariahs, amateur lawyers, sometime sleuths, etc.• The sleuths are in more danger with every discovery they make.Origin sleuth (1800-1900) sleuthhound “dog used for tracking people” ((14-20 centuries)), from sleuth “track” ((12-15 centuries)) (from Old Norse sloth) + hound 