Noun

1. A person who steals, lies, cheats or does other dishonest or illegal things; a criminal.
   • 1973 (November 17), President Richard Nixon

     People have got to know whether or not their President is a crook. Well, I'm not a crook. I've earned everything I've got.

2. A shepard's crook; a staff with a semi-circular bend ("hook") at one end used by shepherds.

   1970 The New English Bible with the Apocrypha, Oxford Study Edition, pub 1976, Oxford University Press; Psalms 23-4, p583:

   • Even though I walk through a / valley dark as death / I fear no evil, for thou art with me, / thy staff and thy crook are my / comfort.

3. A bend.

   She held the baby in the crook of her arm.

Adjective

1. ill, sick.
2. not right, not up to standard

   That work you did on my car is crook, mate

   Not turning up for training was pretty crook.

Quotations

• Other Australian Usage to be sorted out

  to go crook at someone, something; to get angry

  to be crook at/about someone, something; to be annoyed, upset

  crook as Rookwood. To be very sick (Rookwood is the main cemetry of Sydney)