verb

• (transitive, nautical) To rotate or turn something about its axis.
  "His gunnery officer, Lieutenant Commander William R. D. Nickelson, Jr., preferred to respond with other hardware. At once he shouted into his headset mike: "Fuck that! Open fire!" His assistant, Lloyd Mustin, was recording accurate ranges from the narrowcasting fire-control radar and didn't need help from other wavelengths. "Action port. Illuminating ship is target," he instructed his gun captains. Mustin, controlling the after trio of five-inch mounts, and Nickelson slewed their directors onto the lights and opened fire immediately."
• (transitive) To veer a vehicle.
  "As the 5th Battle Squadron comes into the range of the High Seas Fleet, Admiral Evan-Thomas, who, so far, has dutifully followed Beatty's orders (or lack of them), has finally had just about enough. He can see the danger, plain as day, as the High Seas Fleet's leading elements open up a barrage with every gun they possess. He therefore issues his own squadron orders to expect to have to make sudden course changes and to follow his lead, before ordering the wheel hard over and slewing Barham around. Valiant and Warspite move to follow, replicating the "turn in succession" order, whilst the trailing HMS Malaya sees the oncoming danger and prepares to turn as soon as it possibly can without crashing into Warspite."
• (transitive) To insert extra ticks or skip some ticks of a clock to slowly correct its time.
• (intransitive) To pivot.