Meaning of luff tackle

luff' tack"le

Pronunciation: [key]
— Naut. Naut.
  1. a tackle having a double block and a single block, giving a mechanical advantage of three or four, neglecting friction, depending on which is the standing and which is the running block. See diag. under
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.