from The Century Dictionary and Cyclopedia
- n. In mech. engin., a jack constructed on the same principle as a lazy-tongs, consisting of compound levers pivoted together.
- n. Nautical, a length of rope rove through a thimble, seized on to the boom-topping lift, and made fast to the boom. When the sail is lowered the jacks prevent the folds of canvas from falling on the deck.
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