Definition(s)
Breaking Line (Break-out Line, Make-up Line, Jerk Line, Snap Line)
A wire rope or fiber rope or chain, one end of which is secured to a tong handle and the other end attached to or wound on a mechanical device to impart a pulling power on the tong leverage arm or handle.
Source: Petroleum Safety Orders–Drilling and Production, Definitions, California Code of Regulations, 8 CCR § 6505, December 2012. Regulations