Slackline
Slackline turns up in 2 fields: mining, shop slang. Here is what it means to the people in each one.
Slackline in mining
A dangerous condition where a hoisting rope loses tension and hangs loosely in the shaft.
A hoisting or hauling rope that has lost its tension, creating a hazardous loop or sag. In vertical shaft systems, a slackline occurs when a cage or skip gets hung up on the guides while the hoist continues to pay out rope. If the conveyance suddenly breaks free and drops, the resulting snap can sever the cable.
"The hoist tripped on a slackline fault when the cage caught on some damaged timber."
Slackline in shop slang
A hoist cable, winch rope, or rigging line that has lost its tension.
A condition in rigging and hoisting where a load-bearing cable goes completely limp. This happens when a suspended load touches the ground or gets hung up on an obstacle while the winch keeps paying out line. A slackline is highly dangerous because the cable can unspool unevenly or snap violently if the load suddenly drops and catches the slack.
"Stop the winch, you've got a slackline on the main hook."