top-block
noun1
Nautical, Transport A large ironbound block strapped with a hook, and, when used, hung to an eyebolt in the cap, used in swaying and lowering the topmast.
- Underneath this Cap are Eye - bolts (b) , on each side : one is for the top Block, and the foremost one for the Fore Lift Block to hook to1819, Darcy Lever, The Young Sea Officer's Sheet Anchor: