A triangular sail set upon a stay or halyard extending from the foremast or fore-topmast to the bowsprit or the jib boom. Large vessels often carry several jibs; as, inner jib; outer jib; flying jib; etc.
- Nautical A triangular sail stretching from the foretopmast head to the jib boom and in small craft to the bowsprit or the bow.
- The arm of a mechanical crane.
- The boom of a derrick.
- To stop short and turn restively from side to side; balk.