(1):

(n.) A name given to several kinds of a fish, as the common bluefish, the alewife, the bonito, the butterfish, the cutlass fish, the jurel, the leather jacket, the runner, the saurel, the saury, the threadfish, etc.

(2):

(n.) An elater; a snap bug, or snapping beetle.

(3):

(n.) A shallow sailboat with a rectilinear or V-shaped cross section.

(4):

(n.) An upstart.