1888 Lockwood's Dict. Mech. Engin.Return Block, a snatch block.
2004 W. B. Dinsmoor & W. B. DinsmoorPropylaia to Athenian Akropolis II. ii. xiv. 220/2 The new inner block is not mitered for its entire width,..but only for 0.06 m, the depth to which it is cut back to receive the end of the return block.