Lug
Lug turns up in 2 fields: electricians, automotive. Here is what it means to the people in each one.
Lug in electricians
A heavy-duty terminal used to connect a large gauge wire to equipment.
A metal connector attached to the end of a thick electrical conductor to bolt it securely to a panel, breaker, or grounding point. The wire is either crimped into the barrel of the device using a hydraulic tool or clamped down with a set screw.
"Grab the torque wrench and make sure every lug in the main panel is tightened to spec."
Lug in automotive
To force an engine to pull a load at an excessively low RPM in a high gear.
Driving at a very low engine speed in a high gear places massive mechanical stress on the rotating assembly. When the driver applies heavy throttle under these conditions, the engine struggles to accelerate, often shuddering and producing a deep, booming resonance. This practice creates severe cylinder pressures that can cause low-speed pre-ignition and destroy connecting rod bearings.
"Don't lug it up the hill in fifth gear, drop down to third and let the engine rev."