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sleuth (n.)

c. 1200, "track or trail of a person," from Old Norse sloð "trail," of uncertain origin. Meaning "detective" is 1872, shortening of sleuth-hound "keen investigator" (1849), a figurative use of a word that dates back to late 14c. meaning a kind of bloodhound. The verb (intransitive) meaning "to act as a detective, investigate" is recorded from 1905. Related: Sleuthed; sleuthing.

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Definitions of sleuth from WordNet
1
sleuth (v.)
watch, observe, or inquire secretly;
Synonyms: spy / stag / snoop
2
sleuth (n.)
a detective who follows a trail;
Synonyms: sleuthhound
From wordnet.princeton.edu