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Definition of block off:

  1. A grooved pulley or sheave incased in a frame or shell which is provided with a hook, eye, or strap, by which it may be attached to an object. It is used to change the direction of motion, as in raising a heavy object that can not be conveniently reached, and also, when two or more such sheaves are compounded, to change the rate of motion, or to exert increased force; -- used especially in the rigging of ships, and in tackles.

Synonyms:

forget, knock something on the head, barricado, check, jam something open/shut, obturate, quit, stuff, relegate, block, hinder, obstruct, close off, lock out, deflect, choke up, kibosh, hold on, exclude, prohibit, impede, lug, seal off, finish, avert, avoid, immobilize, fasten, shut off, give up, lay off, freeze, debar, block up, arrest, shut, stop, terminate, end, barricade, close up, jam, bar, prevent, contain, turn back, break, cease, halt, blockade, stymie, embarrass, intercept, stop over, bolt, banish, parry, seal, discourage, squash, discontinue, occlude, immobilise, hold back, draw a blank, get in the way of something, stymy, blank out, break off.