1. a bent or curved implement, appendage, etc.; hook. 2. the hooked part of anything. 3. an instrument or implement having a bent or curved part, as a bishop's crosier. 4. a dishonest person, esp. a swindler or thief. 5. a bend or curve. 6. to bend; curve: to crook one's finger. 7. to bend; curve. adj. Australian. 1. sick; ill. More @Wikipedia
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