sleuth /sluːθ/noun 5verb 1forms 3 noun5 •A detective.Do ye want me to become a sleuth, or engage detectives to track the objects of your erroneous philanthropy? — 1908 •(rare) A group of bears.As quietly as if I were practicing to join a sleuth of bears, I crept out the door and went on home, eventually winding up in the garage… — 1961 •(no longer used) A sleuthhound; a bloodhound. •(no longer used) An animal’s trail or track. •(no longer used) Slowness; laziness, sloth. verb1 •To act as a detective; to try to discover who committed a crime, or, more generally, to solve a mystery.We must discover where he lives, what he does — sleuth him, in fact! — 1922 formssleuthed · sleuthing · sleuths