easily rub off on sails and crew. The term "slush" is also used to describe the grease applied to the masts to lubricate the parrels so that the yards can raise and lower freely. References Chapman, C. Piloting, Seamanship and Small Boat Handling, Hearst Corporation, 1972. http://www.thesquarerigger.com/worm_parcel-and_serve.html Also see: The Young Sea Officer's Sheet Anchor, or a Key to the Leading of Rigging and Practical Seamanship, Darcy Lever, page 3, Nautical terminology Ropework