noun

• (obsolete) A lock or curl of hair.
• (obsolete) A support beam consisting of a post with a cross-beam resting upon it; a bracket or truss consisting of a vertical piece, a horizontal piece, and a strut.
• (music) A small tube, usually curved, applied to a trumpet, horn, etc., to change its pitch or key.

verb

• (transitive) To bend, or form into a hook.
  "He crooked his finger toward me."
• (intransitive) To become bent or hooked.

adj

• (Australia, New Zealand, slang) Bad, unsatisfactory, not up to standard.
  "That work you did on my car is crook, mate."
• (Australia, New Zealand, slang) Ill, sick.
  "I′m feeling a bit crook."
• (Australia, New Zealand, slang) Annoyed, angry; upset.
  "be crook at/about; go crook at"