What is the origin of 'sleep tight'?
Read moreOne of the mysteries of the English language finally explained.
See definition of sleuth
1
private detective, detective, private investigator, investigator
British enquiry agent
private eye, PI, snoop, sleuth-hound
North American private dick, dick, peeper, shamus, gumshoe
dated hawkshaw, sherlock
North American dated Pinkerton