1. a rope used in towing

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• rowing line,
• fowing line,
• gowing line,
• yowing line,
• 6owing line,
• 5owing line,
• tiwing line,
• tkwing line,
• tlwing line,
• tpwing line,
• t0wing line,
• t9wing line,
• toqing line,
• toaing line,
• tosing line,
• toeing line,
• to3ing line,
• to2ing line,
• towung line,
• towjng line

The adjective form of "towing line" is "towing".

The plural form of "towing line" is "towing lines".

The singular form of the word "towing line" is "towing line" itself.