Webster's English Dictionary

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jib

1. jib \'jib\ n [origin unknown] : a triangular sail set on a stay 
   extending from the head of the foremast  to the bowsprit or the jibboom
2. jib vb or jibbed;  or jib.bing : to cause (as a sail) to swing from one 
   side of a ship to the other  : to shift across or swing round from one side 
   of a ship to the other 
3. jib n [prob. by shortening & alter. fr. gibbet] 1: the projecting arm of 
   a crane  2: a derrick boom 
4. jib vi or jibbed;  or jib.bing [prob. fr. 2jib] : to refuse to go : BALK 
    - jib.ber n