(nautical) A block with a projection, or shoulder, near the upper end, so that it can rest against a spar without jamming the rope.

(nautical) A block at the extremity of a yard, through which the halyard of a studding sail is rove.

(rail transport) On railways, a system by which the track is divided into sections of three or four miles, and trains are run by the guidance of electric signals so that no train enters a section or block before the preceding train has left it.

(nautical) A block fixed in the topgallant or royal rigging, used for raising and lowering light masts and spars.

simple past tense and past participle of chump block

Either of two wooden or iron blocks intended to serve instead of buffers at the end of a freight car.

present participle of chump block

(collectible card games) To block an attack from a powerful attacker with a weak defender that will neither survive the attack nor destroy the attacker.

past participle of auto-block

present participle of auto-block