- A large marine fish with a long, pointed bill, Xiphias gladius.
- 1913, Joseph C. Lincoln, chapter 1, in Mr. Pratt's Patients:
- Then there came a reg'lar terror of a sou'wester same as you don't get one summer in a thousand, and blowed the shanty flat and ripped about half of the weir poles out of the sand. We spent consider'ble money getting 'em reset, and then a swordfish got into the pound and tore the nets all to slathers, right in the middle of the squiteague season.
- A sudoku technique involving possible cell locations for a digit, or pair, or triple, in uniquely three rows and three columns only. This allows for the elimination of candidates around the grid.
- To fish for swordfish.