1 A rope or tackle used to control the lateral movement of a derrick.
2 A rope or wire led forward from a boom as part of the running rigging of a fore-and-aft-rigged vessel. In sailing yachts, a guy, called a boom guy, may be rigged between the end of the boom and a point well forward when running free, particularly in light winds, or when the yacht is rolling in a swell. A spinnaker boom nearly always needs a boom guy (or spinnaker guy) because the sheet of this sail has less control of it than the sheet of a mainsail.
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