any triangular fore-and-aft sail (set forward of the foremast)
A triangular staysail set forward of the foremast. In a sloop (see image) the basic jib reaches back roughly to the level of the mast.
The projecting arm of a crane.
One who jibs or balks, refusing to continue forward.
Crystal meth.
The mouth, sometimes particularly the tongue, underlip, or tooth.
"He nervously pushed his jib out as he waited for the results."
To shift, or swing around, as a sail, boom, yard, etc., as in tacking.
To stop and refuse to go forward (usually of a horse).
"The old mare jibbed at the steep hill, refusing to move another step."
The word "jib" has been used since the 1660s, though its exact origins remain unknown. It may be related to a different sense of the same word meaning "to shift or swing around."