The log which, if removed, would free up the whole logjam.

Third-person singular simple present indicative form of log off

present participle of log off

plural of Yule log

(idiomatic, slang, vulgar, of a male) To masturbate.

A small simple dwelling made from logs.

(nautical) A chip log

(nautical) A taffrail log

(nautical) A simple device for measuring the speed of a vessel, consisting of a wooden board (drag) attached to a line on a reel.

(nautical) A mechanical device dragged from the stern of the vessel that indicates the vessel's speed through the water; usually consists of a propeller, a reading unit and a stiff line connecting them.